单选题Why are coral reefs called the rainforests of the sea?ABecause they are home to a wide varie of sea life.BBecause they can protect our coasts from storms.CBecause they might supply natural medicines.DBecause they look like rainforests.
单选题
Why are coral reefs called the rainforests of the sea?
A
Because they are home to a wide varie of sea life.
B
Because they can protect our coasts from storms.
C
Because they might supply natural medicines.
D
Because they look like rainforests.
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According to Paragraph 2, why may a person suddenly forget who has called?A. He may leave his prefrontal cortex temporarily damaged.B. He is probably interrupted by another task.C. He is probably not very familiar with the person he has called.D. He may need a rest between dialing and speaking.
EA rainforest is an area covered by tall trees with the total high rainfall spreading quite equally through the year and the temperature rarely dipping below l6℃．Rainforests have a great effect on the world environment because they can take in heat from the sun and adjust the climate．Without the forest cover，these areas would reflect more heat into the atmosphere，warming the rest of the world. Losing the rainforests may also influence wind and rainfall patterns，potentially causing certain natural disasters all over the world．In the past hundred years，humans have begun destroying rainforests in search of three major resources(资源)：land for crops，wood for paper and other products，land for raising farm animals．This action affects the environment as a whole．For example，a lot of carbon dioxide (二氧化碳)in the air comes from burning the rainforests．People obviously have a need for the resources we gain from cutting trees but we will suffer much more than we will benefit.There are two main reasons for this．Firstly，when people cut down trees，generally they can only use the land for a year or two．Secondly，cutting large sections of rainforests may provide a good supply of wood right now，but in the long run it actually reduces the world’s wood supply．Rainforests are often called the world’s drug store．More than 25％ of the medicines we use today come from plants in rainforests．However，fewer than l％of rainforest plants have been examined for their medical value．It is extremely likely that our best chance to cure diseases lies somewhere in the world’s shrinking rainforests．72．Rainforests can help to adjust the climate because they ．A．reflect more heat into the atmosphereB．bring about high rainfall throughout the worldC．rarely cause the temperature to drop lower than l6℃D．reduce the effect of heat from the sun on the earth
What might be the best title for the text?A．How to Save RainforestsB．How to Protect NatureC．Rainforests and the EnvironmentD．Rainforests and Medical Development
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共用题干Caribbean IslandsWhat would you see if you took a cruise to the Caribbean Islands?Palm trees and coconuts（椰子）?White beaches and clear, blue ocean? Colortul corals（珊瑚）and even more colorlu!fishes and birds?You bet.There are thousands of islands in the Caribbean Sea,They are famous for their warm,tropical climate and great natural beauty.The Caribbean Islands form a chain that separates the Caribbean Sea from the rest of the Atlantic Ocean._________(1)Many of the islands were formed by the eruption （爆发）of ancient volcanoes（火山）.Others are low-lying coral islands that gradually rose from the ocean.The Caribbean Islands are known by several names.__________(2)The explorer Christopher Columbus called the islands the Indies in 1492 because he thought he was near the coast of India.Later,Spain and France called the islands the Antilles.There are four large islands in the Caribbean Sea.________(3)These four islands are often called the Greater Antilles.Together,they account for about 90 percent of the land area of the Caribbean Islands.The rest of the Caribbean Islands are much smaller.______(4)You can see why pirates such as the famous Blackbeard sailed these waters.There are countless small islands to bury treasure or hide on.The weather of the Caribbean Sea is almost always warm and sunny.Sandy beaches line the coasts of many islands.__________(5)Many tourists arrive on cruise ships.________（3）A: But life on the Caribbean Islands is not always paradise.B:The earliest name used by Europeans is the Indies,later changed to the West Indies.C: They're like a long necklace that stretches between North and South America.D: They are Cuba,Puerto Rico,Jamaica,and Hispaniola.E: This is why millions of tourists visit the islands each year.F: Some of these islands are no more than tiny slivers（小片）of exposed coral.
共用题干Water一the Issue of This CenturyThe world is running short of freshwater. Populations are growing bigger and thirstier （渴的）,with the result that freshwater is becoming increasingly scarce（缺乏）.Half the world's wetlands have disappeared during the last century,while estimates suggest that wa- ter use will rise by 50% in the next 30 years.The World Bank report estimates that as much as half of the world's population,concentrated in Africa,the Middle East and south Asia,will face“severe water shortages”by 2025.Local water conflicts and the loss of freshwater ecosystems appear large in some re- gions.A similar picture emerges from the globe's salt water regions. Three-quarters of the world's people may live within 100km of the sea in 2025,putting even more pressure on stretched coastal ecosystems. Two thirds of fisheries（渔业）are exploited at or beyond their sustainable limits, and half the world's coral reefs（珊瑚礁）may perish in 100 years. Almost 60% of coral reefs and 34% of fish species are at risk from human activities,the Bank says.The report concludes that there is ample evidence to justify immediate and coordinated action to safeguard supplies and use water more efficiently.Fresh water consumption is rising quickly,and the availability of water in some regions is likely to become one of the most pressing issues of the 21st century.A third of the world's popu1ation一around two billion people一live in countries that are experiencing moderate to high water shortages.That proportion could rise to half or more in the next 30 years unless institutions（制度）change to ensure better conservation and alloca- tion of water.China is one country where the portents（征兆）are gloomy. The most waterstressed country in East Asia,China is exploiting 44%of its usable water,a figure projected to rise to6O%by 2020.Primary withdrawal of water of more than 60%is widely considered by water experts to exceed the environmental carrying capacity of a river basin system. AlthoughChina's total use appears still to be reasonable,it has several basins that are severely stressed environmentally.Withdrawals exceed environmental limits in Afghanistan and Pakistan,and will exceed them in India by 2020.In the Middle East and North Africa,only Morocco has unexploited water resources.The rest have exceeded environmental limits and many are mining aquifers （蓄水层）一bodies of water-bearing rock一the report says.Almost all coral reefs may disappear in 100 years.A: RightB: WrongC: Not mentioned
共用题干The SeaWhat do you know about the sea?We know that it looks very pretty when the sun is shining on it.We also know that it can be very rough when there is a strong wind.What other things do we know about it?The first thing to remember is that the sea is very big.When you look at the map of the world you will find there is more water than land.The sea covers three quarters of the world.The sea is also very deep in some places.It is not deep everywhere.Some parts of the sea are very shal-low.But in some places the depth of the sea is very great.There is one spot,near Japan,where the sea is nearly 11 kilometers deep!The highest mountain in the world is about 9 kilometers high.If that mountainwere put into the sea at that place,there would be 2 kilometers of water above it！What a deep place!If you have swum in the sea,you know that it is salty.You can taste the salt,Rivers,which fi0w into the sea.carry salt from the land into the sea.Some parts of the sea are saltier than other parts,There i、one sea,called the Dead Sea,which is very salty.It is so salty that swimmers cannot sink!Fish cannot live in theDead Sea!In most parts of the sea,there are plenty of fishes and plants.Some live near the top of the sca.Othurslive deep down.There are millions of tiny living things that float in the sea.These floating things are so smallthat it is hard to see them.Many fish live by eating them.The sea can be very cold.Divers,who go deep down in the sea,know this.On the top the water may bewarm.When the diver goes downwards,the sea becomnes colder and colder. Another thing happens.When the diver goes deeper,the water above presses down on him.It squeezes him.Then the diver has to wear clothesmade of metal.But he cannot go very deep.Some people who wanted to go very deep used a very strong diving ship!They went down to the deepest part of the sea in it.They went down to a depth of eleven kilometers!The sea is 6 kilometers in depth on average.A:RightB:WrongC:Not mentioned
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单选题Most drill ships and barges have a walled opening below the derrick，open to the water’s surface and through which various drilling tools can pass down to the sea floor called a （）.Amoon poolBspider deck openingCpontoonDkeyway
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