单选题In April of 2004, d dogs and c cats lived in an animal shelter. If 4 cats arrived at the shelter in May of 2004 and the ratio of dogs to cats remained unchanged, in terms of c and d, how many dogs arrived at the shelter in May of 2004?A4B4d/cCd/cDd2-4dE2cd+4d/c
单选题
In April of 2004, d dogs and c cats lived in an animal shelter. If 4 cats arrived at the shelter in May of 2004 and the ratio of dogs to cats remained unchanged, in terms of c and d, how many dogs arrived at the shelter in May of 2004?
A
4
B
4d/c
C
d/c
D
d2-4d
E
2cd+4d/c
参考解析
解析：
狗和猫的比例原来为d/c，因为五月份多了4只猫，所以现在共有c + 4只猫。假设狗的数量增加了x只，因为狗和猫的比例依旧保持不变，所以(d+x)/(c+4)=d/c,c(d+x)=d(c+4);cx=4d,x=4d/c。
狗和猫的比例原来为d/c，因为五月份多了4只猫，所以现在共有c + 4只猫。假设狗的数量增加了x只，因为狗和猫的比例依旧保持不变，所以(d+x)/(c+4)=d/c,c(d+x)=d(c+4);cx=4d,x=4d/c。
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Passage TwoThe lion may be the most famous of all the predators of Africa, but one of the most fascinating is the wild dog. Wild dogs are fairly small, averaging seventy pounds, with round, fanlike ears that look too big for their heads. They have shaggy brown coats with scattered patches of white. One of these animals by itself looks harmless or even comical. But when they band together, in packs of up to forty, the wild dogs become dangerous predators that tirelessly run down and kill animals that are many times their own size.Wild dogs have to be good hunters in order to feed their large families; a single female can have as many as sixteen pups at a time. But usually only one female in a pack breeds at a time, and all the pack members help to care for the young. At first, the pups feed on their mother's milk. Then the other dogs begin to bring back meat from the kill, carrying it in their stomachs and throwing it up when the pups come running to them to beg for food. Finally, the young dogs begin to go along on hunts. At this time one of the most striking differences between wild dogs and lions can be seen. When a pride of lions makes a kill, the adult males always eat their fill first. But the wild dogs let the pups feed first, even when they are still too young to really help in making the kill.36. A good title for this passage would be ______.A. Africa's Wild DogsB. Killers of the PlainsC. Predators of AfricaD. The Greedy Lion
Passage FiveMany superstitious people are afraid of black cats. They believe that black cats have a strange power. If a black cat crosses their path, they think they will have bad luck.Black cats haven't always had such a bad reputation. Long ago, the Egyptians thought that black cats were holy animals. They even worshipped them. Pasht was an Egyptian goddess who had a woman's body and a cat's head. Because the Egyptians had so much respect for black cats, they often buried the sacred creatures with great ceremony. Mummies of cats have often been found in ancient cemetery ruins. To keep the cats company after they died, mice were sometimes buried beside them.Feelings about black cats have always been strong. People have thought they were either very good or very bad. The people of Europe, in the Middle Ages, believed black cats were the evil friends of witches and the Devil. Witches were said to have the power to change themselves into black cats. People believed that you could not tell whether a black cat was just a cat, or whether it was a witch disguising herself as she plotted some evil scheme. The brain of a black cat was thought to be a main ingredient in witch's brew.Unlike their ancestors of the Middle Ages, Englishmen today consider black cats to be good luck charms. Fishermen's wives often keep a black cat around so that their husbands will be protected when they are out at sea.52. The Egyptian goddess Pasht had a ______.A. woman's head and a cat's bodyB. woman's head and a lion's bodyC. cat's head and a man's bodyD. woman's body and a cat's head
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请阅读短文，完成第小题。Photographer Teresa Berg replaces a Rottweiler's collar with a pink scarf. She picks a string of pearls to complement a dachshund's coat. She is taking glamour shots of shelter dogs, hoping her spiffed-up subjects will be adopted more quickly."Most photos show dogs in cages, looking dirty, and mangy," says Berg. "I consider my work like an antismoking campaign. We have to make adopting cool."Her father wouldn't allow her a dog of her own as a kid. He did, however, show her how to use a camera. Together, they took pictures and developed them at his office.Living in Dallas at 24, Berg found her perfect roommate on the street: a Border collie-Shetland sheepdog mix she named Gpsy. Berg always has a soft spot for the ones that don't have anyone to love.For years, she worked as a real estate agent, but she quit in 2006 to launch a photography business. Searching the Internet for a dog to adopt as a companion for Max, her Pomeranian, she was instantly put off by the photos online:"They had dirty laundry, dirty dishes, and empty pizza boxes in the background," she says.Berg finally found Flash, a 12-year old long-haired dachshund who was a Dallas rescue dog. She went to pick him up and ended up volunteering to take pictures of all the rescued dogs there for free. As more dogs went to the program, she took their pictures too. In the following year, after the photos went up on the website of the Dallas-Fort Worth Dachshund Rescue, the group's director noticed that adoptions had doubled compared with last year. She attributed this to the professional photos. "When dogs are adopted that quickly, it makes room for others off the streets, "Berg says.Over the years, Berg has developed some tricks to snap flattering pictures: position dogs so that light falls on their faces, and shoot at eye level. In 2011, hoping to inspire more photographers, Berg posted video seminars on focusonrescue.com. About 75 people per month now watch her offer tips for taking quality pet photos. She's gratified to see the recent wave of well-shot dog photography on shelter websites and social-media sites.In the past couple of years, Berg has added two dogs to the Dallas home she shares with Flash and her husband: a dachshund named Jasper and a Pomeranian named Maggie:"I want to take all the shelter dogs home; that's the hard part," Berg says."I have a particular affinity for dogs with gray muzzles."Why did Berg, the photographer, put scarf and pearls on shelter dogs?查看材料A．Because she enjoyed taking fancy pictures of dogs.B．Because she was a faithful antismoking campaigner.C．Because she wanted to make their adoption quick and enjoyable.D．Because she felt relieved to make them look attractive and stylish.
请阅读短文，完成第小题。Photographer Teresa Berg replaces a Rottweiler's collar with a pink scarf. She picks a string of pearls to complement a dachshund's coat. She is taking glamour shots of shelter dogs, hoping her spiffed-up subjects will be adopted more quickly."Most photos show dogs in cages, looking dirty, and mangy," says Berg. "I consider my work like an antismoking campaign. We have to make adopting cool."Her father wouldn't allow her a dog of her own as a kid. He did, however, show her how to use a camera. Together, they took pictures and developed them at his office.Living in Dallas at 24, Berg found her perfect roommate on the street: a Border collie-Shetland sheepdog mix she named Gpsy. Berg always has a soft spot for the ones that don't have anyone to love.For years, she worked as a real estate agent, but she quit in 2006 to launch a photography business. Searching the Internet for a dog to adopt as a companion for Max, her Pomeranian, she was instantly put off by the photos online:"They had dirty laundry, dirty dishes, and empty pizza boxes in the background," she says.Berg finally found Flash, a 12-year old long-haired dachshund who was a Dallas rescue dog. She went to pick him up and ended up volunteering to take pictures of all the rescued dogs there for free. As more dogs went to the program, she took their pictures too. In the following year, after the photos went up on the website of the Dallas-Fort Worth Dachshund Rescue, the group's director noticed that adoptions had doubled compared with last year. She attributed this to the professional photos. "When dogs are adopted that quickly, it makes room for others off the streets, "Berg says.Over the years, Berg has developed some tricks to snap flattering pictures: position dogs so that light falls on their faces, and shoot at eye level. In 2011, hoping to inspire more photographers, Berg posted video seminars on focusonrescue.com. About 75 people per month now watch her offer tips for taking quality pet photos. She's gratified to see the recent wave of well-shot dog photography on shelter websites and social-media sites.In the past couple of years, Berg has added two dogs to the Dallas home she shares with Flash and her husband: a dachshund named Jasper and a Pomeranian named Maggie:"I want to take all the shelter dogs home; that's the hard part," Berg says."I have a particular affinity for dogs with gray muzzles."What does the underlined word "muzzles" in the last PARAGRAPH most probably mean?查看材料A．Mouth and tongue.B．Nose and mouth.C．Chest and shoulders.D．Elbow and forearms.
请阅读短文，完成第小题。Photographer Teresa Berg replaces a Rottweiler's collar with a pink scarf. She picks a string of pearls to complement a dachshund's coat. She is taking glamour shots of shelter dogs, hoping her spiffed-up subjects will be adopted more quickly."Most photos show dogs in cages, looking dirty, and mangy," says Berg. "I consider my work like an antismoking campaign. We have to make adopting cool."Her father wouldn't allow her a dog of her own as a kid. He did, however, show her how to use a camera. Together, they took pictures and developed them at his office.Living in Dallas at 24, Berg found her perfect roommate on the street: a Border collie-Shetland sheepdog mix she named Gpsy. Berg always has a soft spot for the ones that don't have anyone to love.For years, she worked as a real estate agent, but she quit in 2006 to launch a photography business. Searching the Internet for a dog to adopt as a companion for Max, her Pomeranian, she was instantly put off by the photos online:"They had dirty laundry, dirty dishes, and empty pizza boxes in the background," she says.Berg finally found Flash, a 12-year old long-haired dachshund who was a Dallas rescue dog. She went to pick him up and ended up volunteering to take pictures of all the rescued dogs there for free. As more dogs went to the program, she took their pictures too. In the following year, after the photos went up on the website of the Dallas-Fort Worth Dachshund Rescue, the group's director noticed that adoptions had doubled compared with last year. She attributed this to the professional photos. "When dogs are adopted that quickly, it makes room for others off the streets, "Berg says.Over the years, Berg has developed some tricks to snap flattering pictures: position dogs so that light falls on their faces, and shoot at eye level. In 2011, hoping to inspire more photographers, Berg posted video seminars on focusonrescue.com. About 75 people per month now watch her offer tips for taking quality pet photos. She's gratified to see the recent wave of well-shot dog photography on shelter websites and social-media sites.In the past couple of years, Berg has added two dogs to the Dallas home she shares with Flash and her husband: a dachshund named Jasper and a Pomeranian named Maggie:"I want to take all the shelter dogs home; that's the hard part," Berg says."I have a particular affinity for dogs with gray muzzles."How many dogs has Berg adopted altogether?查看材料A．Six.B．Five.C．Four.D．Three.
请阅读短文，完成第小题。Photographer Teresa Berg replaces a Rottweiler's collar with a pink scarf. She picks a string of pearls to complement a dachshund's coat. She is taking glamour shots of shelter dogs, hoping her spiffed-up subjects will be adopted more quickly."Most photos show dogs in cages, looking dirty, and mangy," says Berg. "I consider my work like an antismoking campaign. We have to make adopting cool."Her father wouldn't allow her a dog of her own as a kid. He did, however, show her how to use a camera. Together, they took pictures and developed them at his office.Living in Dallas at 24, Berg found her perfect roommate on the street: a Border collie-Shetland sheepdog mix she named Gpsy. Berg always has a soft spot for the ones that don't have anyone to love.For years, she worked as a real estate agent, but she quit in 2006 to launch a photography business. Searching the Internet for a dog to adopt as a companion for Max, her Pomeranian, she was instantly put off by the photos online:"They had dirty laundry, dirty dishes, and empty pizza boxes in the background," she says.Berg finally found Flash, a 12-year old long-haired dachshund who was a Dallas rescue dog. She went to pick him up and ended up volunteering to take pictures of all the rescued dogs there for free. As more dogs went to the program, she took their pictures too. In the following year, after the photos went up on the website of the Dallas-Fort Worth Dachshund Rescue, the group's director noticed that adoptions had doubled compared with last year. She attributed this to the professional photos. "When dogs are adopted that quickly, it makes room for others off the streets, "Berg says.Over the years, Berg has developed some tricks to snap flattering pictures: position dogs so that light falls on their faces, and shoot at eye level. In 2011, hoping to inspire more photographers, Berg posted video seminars on focusonrescue.com. About 75 people per month now watch her offer tips for taking quality pet photos. She's gratified to see the recent wave of well-shot dog photography on shelter websites and social-media sites.In the past couple of years, Berg has added two dogs to the Dallas home she shares with Flash and her husband: a dachshund named Jasper and a Pomeranian named Maggie:"I want to take all the shelter dogs home; that's the hard part," Berg says."I have a particular affinity for dogs with gray muzzles."Which of the following best describes the effect produced by Berg' s efforts?查看材料A．They have spared more rooms for shelter dogs to live in.B．They have gained her more professional fame as a photographer.C．They have enabled her to adopt one more dog from Dallas rescue group.D．They have made online adoptions increase twice as much as last year.
Love Animal ShelterFoster Owner ProgramYou can help save a dog's life by becoming a foster owner until we find a loving owner to adopt your pet or until we reunite them with their original owner. We have dogs of all ages for you to care for, and many require special attention.Although being a foster owner is one of the most rewarding experiences in the world, its emotional, physical, and financial demands should be given careful consideration. For this reason, we require all of our applicants go through an orientation program at our shelter so that they can get used to the responsibilities of caring for a dog and decide for themselves if they would like to continue doing it. We will also have one of our staff conduct a home and lifestyle evaluation to determine if each applicant's living situation is suitable for one of our dogs. Additionally, once a dog has been placed in your care, our adoption center will be on call 24 hours a day, seven days a week to help with any situations that arises.For more information on our foster owner program, including testimonials from current and previous foster owners, visit www.loveanimalshelter.com.What is the purpose of the advertisement? A. To encourage people to adopt a petB. To encourage people to become foster ownersC. To encourage people to donate to the animal shelterD. To encourage people to volunteer at the animal shelter
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共用题干Experience the World in 3D GameEver wondered how your cat or dog sees the world?Now you can look through their eyes with the first 3 D game that recreates the vision of different species based on scientific evidence.The online simulation,created by the French 3 D design company Dassault Systemes,with the guidance of veterinary ophthalmologist（眼科专家）Didier Schmidt-Morand , mimics（模仿）the vision of five animals-cats,dogs,rats,hawks and bees-as a player steers them through Place in Paris.Due to differences in field of view,colour perception and night vision,for example,sight can be drastically different from species to species.In terms of performance,eyes are as variable as different models of cars,says Schmidt-Morand.The game was created by using existing virtual models of the square then applying effects based on descriptions of each animals vision.Dassaults 3 D software allows a scene to be modified by adding blur or changing the colours,angle of vision and depth of field.Although it was easy to recreate vision inferior to that of humans-cats and dogs,for example,have trouble distinguishing shades of red-replicating features that we are unable to see was a challenge.Hawks have more detailed vision than ours,whereas dogs are better at seeing movement and have a wider field ofview.We used virtual cameras to precisely simulate larger viewing angles but the result made people nauseous（令人作呕的）,says Schmidt-Morand.So we tweaked（微调）the model to give a sense of the wider view without sticking to reality.The rats view also departs from reality:because they are near-sighted,everything more than 15 centimetres away is a blur,so they typically move close to walls to help them navigate.A rat would never throw itself into the middle of an open area,says Schmidt-Morand.The simulation for this animal is supplemented with a map in the top right corner to help determine the rats position:because of their limited eyesight,most landmarks are obscured.The game is intended as an educational resource and players can discuss their experience with others through community features on the website.If there is interest from schools and zoos,the team hopes to recreate the vision of more animals.The game developed by Dassault Systemes is the first 3D game recreating the vision of different species.A:Right B:Wrong C:Not mentioned
共用题干Experience the World in 3D GameEver wondered how your cat or dog sees the world?Now you can look through their eyes with the first 3 D game that recreates the vision of different species based on scientific evidence.The online simulation,created by the French 3 D design company Dassault Systemes,with the guidance of veterinary ophthalmologist（眼科专家）Didier Schmidt-Morand , mimics（模仿）the vision of five animals-cats,dogs,rats,hawks and bees-as a player steers them through Place in Paris.Due to differences in field of view,colour perception and night vision,for example,sight can be drastically different from species to species.In terms of performance,eyes are as variable as different models of cars,says Schmidt-Morand.The game was created by using existing virtual models of the square then applying effects based on descriptions of each animals vision.Dassaults 3 D software allows a scene to be modified by adding blur or changing the colours,angle of vision and depth of field.Although it was easy to recreate vision inferior to that of humans-cats and dogs,for example,have trouble distinguishing shades of red-replicating features that we are unable to see was a challenge.Hawks have more detailed vision than ours,whereas dogs are better at seeing movement and have a wider field ofview.We used virtual cameras to precisely simulate larger viewing angles but the result made people nauseous（令人作呕的）,says Schmidt-Morand.So we tweaked（微调）the model to give a sense of the wider view without sticking to reality.The rats view also departs from reality:because they are near-sighted,everything more than 15 centimetres away is a blur,so they typically move close to walls to help them navigate.A rat would never throw itself into the middle of an open area,says Schmidt-Morand.The simulation for this animal is supplemented with a map in the top right corner to help determine the rats position:because of their limited eyesight,most landmarks are obscured.The game is intended as an educational resource and players can discuss their experience with others through community features on the website.If there is interest from schools and zoos,the team hopes to recreate the vision of more animals.Dogs have larger viewing angles than humans.A:Right B:Wrong C:Not mentioned
共用题干Experience the World in 3D GameEver wondered how your cat or dog sees the world?Now you can look through their eyes with the first 3 D game that recreates the vision of different species based on scientific evidence.The online simulation,created by the French 3 D design company Dassault Systemes,with the guidance of veterinary ophthalmologist（眼科专家）Didier Schmidt-Morand , mimics（模仿）the vision of five animals-cats,dogs,rats,hawks and bees-as a player steers them through Place in Paris.Due to differences in field of view,colour perception and night vision,for example,sight can be drastically different from species to species.In terms of performance,eyes are as variable as different models of cars,says Schmidt-Morand.The game was created by using existing virtual models of the square then applying effects based on descriptions of each animals vision.Dassaults 3 D software allows a scene to be modified by adding blur or changing the colours,angle of vision and depth of field.Although it was easy to recreate vision inferior to that of humans-cats and dogs,for example,have trouble distinguishing shades of red-replicating features that we are unable to see was a challenge.Hawks have more detailed vision than ours,whereas dogs are better at seeing movement and have a wider field ofview.We used virtual cameras to precisely simulate larger viewing angles but the result made people nauseous（令人作呕的）,says Schmidt-Morand.So we tweaked（微调）the model to give a sense of the wider view without sticking to reality.The rats view also departs from reality:because they are near-sighted,everything more than 15 centimetres away is a blur,so they typically move close to walls to help them navigate.A rat would never throw itself into the middle of an open area,says Schmidt-Morand.The simulation for this animal is supplemented with a map in the top right corner to help determine the rats position:because of their limited eyesight,most landmarks are obscured.The game is intended as an educational resource and players can discuss their experience with others through community features on the website.If there is interest from schools and zoos,the team hopes to recreate the vision of more animals.It takes the team the longest time to recreate the rat's view because they're near-sighted.A:Right B:Wrong C:Not mentioned
共用题干Experience the World in 3D GameEver wondered how your cat or dog sees the world?Now you can look through their eyes with the first 3 D game that recreates the vision of different species based on scientific evidence.The online simulation,created by the French 3 D design company Dassault Systemes,with the guidance of veterinary ophthalmologist（眼科专家）Didier Schmidt-Morand , mimics（模仿）the vision of five animals-cats,dogs,rats,hawks and bees-as a player steers them through Place in Paris.Due to differences in field of view,colour perception and night vision,for example,sight can be drastically different from species to species.In terms of performance,eyes are as variable as different models of cars,says Schmidt-Morand.The game was created by using existing virtual models of the square then applying effects based on descriptions of each animals vision.Dassaults 3 D software allows a scene to be modified by adding blur or changing the colours,angle of vision and depth of field.Although it was easy to recreate vision inferior to that of humans-cats and dogs,for example,have trouble distinguishing shades of red-replicating features that we are unable to see was a challenge.Hawks have more detailed vision than ours,whereas dogs are better at seeing movement and have a wider field ofview.We used virtual cameras to precisely simulate larger viewing angles but the result made people nauseous（令人作呕的）,says Schmidt-Morand.So we tweaked（微调）the model to give a sense of the wider view without sticking to reality.The rats view also departs from reality:because they are near-sighted,everything more than 15 centimetres away is a blur,so they typically move close to walls to help them navigate.A rat would never throw itself into the middle of an open area,says Schmidt-Morand.The simulation for this animal is supplemented with a map in the top right corner to help determine the rats position:because of their limited eyesight,most landmarks are obscured.The game is intended as an educational resource and players can discuss their experience with others through community features on the website.If there is interest from schools and zoos,the team hopes to recreate the vision of more animals.Schmidt-Morand's favorite animal is cat.A:Right B:Wrong C:Not mentioned
单选题What does the passage mainly talk about?AHow to live with dogsBExpressions about dogs.CPeople’s love for dogs.DWays to train dogs.
单选题Specialists use dogs to listen to children reading because they think ______.Adogs are young children’s best friendsBchildren can play with dogs while readingCdogs can provide encouragement for shy childrenDchildren and dogs understand each other
单选题如查询谚语（rain cats and dogs）的汉语意思，加（）符号可大大提高搜索的速度和准确率。AB C（）D[ ]