This rare bird has become（）A、an endangered specieB、endangered speciesC、endangering speciesD、an endangered species
This rare bird has become（）
- A、an endangered specie
- B、endangered species
- C、endangering species
- D、an endangered species
相关考题：
187. It is hard to track the blue whale, the ocean’s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior. So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy’s formerly top-secret system of underwater listening devices spanning the oceans. Tracking whales is but one example of all exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies. Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption for the first time and that they plan similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures. The speed of sound in water is roughly one mile a second, slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient’s chest to a doctor’s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles. [共5题](1) The passage is chiefly about ________.(A) an effort to protect an endangered marine species(B) the exposure of a US Navy top-secret weapon(C) the civilian use of a military detection system(D) a new way to look into the behavior. of blue whales(2) The underwater listening system was originally designed ________.(A) to monitor deep-sea volcanic eruptions(B) to replace the global radio communications network(C) to study the movement of ocean currents(D) to trace and locate enemy vessels(3) The deep-sea listening system makes use of ________.(A) the unique property of layers of ocean water in transmitting sound(B) the capability of sound to travel at hligh speed(C) low-frequency sounds travelling across different layers of water(D) the sophisticated technology of focusing sounds under water(4) It can be inferred from the passage that ________.(A) blue whales are no longer endangered with the use of the new listening system(B) new radio devices should be developed for tracking the endangered blue whales(C) military technology has great potential in civilian use(D) opinions differ as to whether civilian scientists should be allowed to use military technology(5) Which of the following is true about the US Navy underwater listening network?(A) It has been replaced by a more advanced system.(B) It is now partly accessible to civilian scientists.(C) It became useless to the military after the cold war.(D) It is indispensable in protecting endangered species.
The Timber rattlesnake is now on the endangered species list, and is extinct in two eastern states in which it once _______ .A thrived B swelled C prospered D flourished
With Switzerland-based World Wildlife Fund, China is making a devoted effort_________ the endangered pandas.A． savedB． savingC． saveD． to save
Why do some people support cloning?() A.It can help those infertile couplesB.It may revolutionize organ transplantationC.It could save seriously endangered speciesD.It may solve the problem of starvation
The loss of biological diversity has become most spectacularly noticeable in extinction or decline of populations of large and well-known animals.Many animal species have become extinct since the 1700’s, among them the California grizzly bear, the dodo, and the passenger pigeon.Hundreds of other animal species are threatened.In North America, endangered species include the black-footed ferret, the California condor, the desert tortoise, and the whooping crane.Most species in danger of extinction anywhere in the world are suffering from the intrusion (侵入) of human beings.The Asian elephant, for example, has become an endangered species due to the expansion of the human population throughout its range in southern Asia.In Africa, the African elephants are being killed off for their tusks.Monkeys and other primates throughout the world are threatened by hunting, capture for medical use, and the destruction of their habitats.And the rhinoceroses, lions, and other large mammals of the African savanna (grassy plains with scattered trees) compete for land and life with some of the most rapidly growing human populations in the world.The loss of biological diversity is most severe, however, in the tropical rain forests.The forests of the tropics are particularly vulnerable to disturbance because the soils have a low capacity for retaining nutrients.Most of the forests’ nutrient elements are held in the tissues of plants.When loggers and farmers destroy existing plant cover, the nutrients are washed from the land into streams, and the land itself becomes less able to support life.Destruction of these forests destroys the habitat of hundreds, sometimes thousands, of species from such creatures as the howler monkey and indigo macaw, to less visible species of plants, insects, and microbes, many of which are not yet known to science.1.The author points out that species extinction ().A.is most noticeable in North AmericaB.is mainly taking place among large animalsC.quickened with industrialization of the societyD.never took place before the 1700’s2.Which of the following is NOT mentioned with regard to human intrusion?A.Elephants are killed off for their tusksB.Some primates are hunted for medical useC.Growing human population results in the competition for land and life among animalsD.Men live increasingly on animals as their source of food.3.The chief cause of the gradual disappearance of biological diversity is ().A.human crueltyB.human interferenceC.the increase of human populationD.the disappearance of the forests4.In tropical forests，().A.animals live a hard life due to competitionB.a lot of species die out for lack of foodC.rains constitute the major threat to speciesD.a greater number of animals are yet to be known5.It can be inferred that species extinction ().A.proceeds of a faster rate than noticeableB.is the worst among well-known animalsC.is the most severe in AfricaD.is chiefly due to competition among species
Biologists are working with the government to create a nature ________to protect the endangered tigers. A.threatB.emergencyC.reserveD.restriction
When students are asked to go to the local museum, libraries, etc. to find out informationabout endangered animals and work out a plan for an exhibition, they are doing a(n)__________.A.surveyB.experimentC.projectD.presentation
The destruction of habitats(栖息地)all over the world is the primary reason species are?becoming extinct(灭绝)or endangered．Houses,highways,dams,industrial buildings,and?ever-spreading farms now dominate?21?formerly occupied by forests,deserts,and wetlands．22?the beginning of European settlement in America,23,over 65,000,000 acres of?wetlands have been drained．One million acres alone vanished24?1985 and 1995．Habitat destruction can be?25?or it can be subtle,occurring over a26?period of time?without being noticed．27?such as sewage from cities and chemical runoff fromfarms,can change?the?28?and quantity of water in streams and rivers．To?29?living in a delicately balanced?habitat,this disturbance can be as30?as the clear-cutting of a rainforest．31?remaining habitats are carved into smaller and smaller pockets or islands,remaining?species are forced to exist in these?32?areas,which causes further habitat?33?These?species become less adaptable to environmental?34；in fact,they become?35?endangered．Scientists believe that when a habitat is cut by 90%,one-half of its plants,animals and insects will?become extinct．第34题的答案是（ ）A.improvementsB.ChangesC.protectionD.development
The destruction of habitats(栖息地)all over the world is the primary reason species are?becoming extinct(灭绝)or endangered．Houses,highways,dams,industrial buildings,and?ever-spreading farms now dominate?21?formerly occupied by forests,deserts,and wetlands．22?the beginning of European settlement in America,23,over 65,000,000 acres of?wetlands have been drained．One million acres alone vanished24?1985 and 1995．Habitat destruction can be?25?or it can be subtle,occurring over a26?period of time?without being noticed．27?such as sewage from cities and chemical runoff fromfarms,can change?the?28?and quantity of water in streams and rivers．To?29?living in a delicately balanced?habitat,this disturbance can be as30?as the clear-cutting of a rainforest．31?remaining habitats are carved into smaller and smaller pockets or islands,remaining?species are forced to exist in these?32?areas,which causes further habitat?33?These?species become less adaptable to environmental?34；in fact,they become?35?endangered．Scientists believe that when a habitat is cut by 90%,one-half of its plants,animals and insects will?become extinct．第29题的答案是（ ）A.peopleB.SpeciesC.plantsD.insects
This rare bird has become（）Aan endangered specieBendangered speciesCendangering speciesDan endangered species
单选题The spread of fire is NOT prevented by（）.Ashutting off the oxygen supplyBcooling surfaces adjacent to the fireCremoving combustibles from the endangered areaDremoving smoke and toxic gases by ensuring adequate ventilation
单选题It can be inferred from the passage that ______.Anew radio devices should be developed for tracking the endangered blue whalesBblue whales are no longer endangered with the use of the new listening systemCopinions differ as to whether civilian scientists should be allowed to use military technologyDmilitary technology has great potential in civilian use
单选题It can be learned that the polar bear _____.Awas first considered by Siegel to be the iconic animal in 1998Bwas first proposed by Siegel to be the endangered species in 2004Cwas not qualified scientifically as the endangered species until 2005Dwas not officially under the government protection until 2008
单选题A great number of national parks have been set up to________ endangered species from extinction.AconserveBpreserveCreserveDobserve
单选题The speaker of the passage is of the opinion that ______.Aprotecting the farmland is more important than protecting wild animalBprotecting endangered species is more important than protecting the interests of the farmersCprotecting the farmland and the wild animals are equally importantDone can rely more on bees than mice to frighten beasts off the farm
单选题This rare bird has become（）Aan endangered specieBendangered speciesCendangering speciesDan endangered species
单选题The problem with Elkhorn and stag horn corals lies in that _____.Athey were not much-liked by many peopleBthey were not well-known enough to be an iconCthey were not considered animals by many peopleDthey were not added to the list of Endangered Species
单选题Siegel and Cummings hoped to choose an animal to _____.Acall on people to take actions against global warmingBmake people aware of the danger of environmental damageCintroduce to people a new concept of environmental protectionDremind people of the importance of protecting endangered species
填空题Endangered Minds, written by Jane Heady, suggests that television has something to do with the change of our brain.____
单选题A frequently cited example of the endangered species is the panda.AworriedBneglectedCreducedDmentioned
单选题Which of the following is true about the U.S. Navy underwater listening net-work?AIt is now partly accessible to civilian scientists.BIt has been replaced by a more advanced system.CIt became useless to the military after the cold war.DIt is indispensable in protecting endangered species.
单选题They gave top priority to protecting endangered animals.AprecedenceBprivilegeCfavorDsignificance
单选题The spread of fire is prevented by（）.Acooling surfaces adjacent to the fireBleaving combustibles in the endangered areaCincreasing the oxygen supplyDAll of the above
单选题The passage is focused on _____.Ahow the scientists tried to protect endangered speciesBhow the symbolic endangered species has been chosenCthe relation between global warming and endangered speciesDthe problems in and the future of endangered species protection
单选题Why are elephants endangered?AThey are changing living habits.BThey are driven into thick forests.CTwo species of disease threaten their lives.DDemand from ivory market leads to their killing.