All kinds of techniques and medicines ______ to extend human beings’ live in recent years.A.have been developedB.are being developedC.were developedD.develop
All kinds of techniques and medicines ______ to extend human beings’ live in recent years.
A.have been developed
B.are being developed
C.were developed
D.develop
B.are being developed
C.were developed
D.develop
参考解析
解析：本题考察动词的时态和语态，题目意为“近年来，各种各样延长人类生命的技术和药物都被开发出来了。”主语是“技术和药物”，因此要使用被动语态，时间状语是in recent years,时态用现在完成时。
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共用题干第二篇Where Have All the Frogs Gone?In the 1980s,scientists around the world began to notice something strange:Frogs were disappearing. More recent research has shown that many kinds of amphibians（两栖动物）are declining or have become extinct. They have been around for a long time一over 350 million years.Why are they dying out now?Scientists are seriously concerned about this question.First of all,amphibians are an important source of scientific and medical knowledge.By studying amphibians,scientists have learned about new substances that could be very useful for treating human diseases. Further research could lead to many more discoveries,but that will be impossible if the amphibians disappear.The most serious aspect of amphibian loss,however,goes beyond the amphibians themselves.Scientists are beginning to think about what amphibian decline means for the planet as a whole.If the earth is becoming unlivable for amphibians,is it also becoming unlivable for other kinds of animals and human beings as well?Scientists now believe that amphibian decline is due to several environmental factors. One of these factors is the destruction of habitat,the natural area where an animal lives. Amphibians are very sensitive to changes in their habitat.If they cannot find the right conditions,they will not lay their eggs一These days,as wild areas are covered with houses,roads,farms,or factories,many kinds of amphibians are no longer laying eggs. For example,the arroyo toad（蟾蜍）of southern California will only lay its eggs on the sandy bottom of a slow-moving stream.There are very few streams left in southern California,and those streams are often muddy because of building projects. Not surprisingily,the arrovo toad is now in danaer of extinction.There are a number of other factors in amphibian decline.Pollution is one of them.In many industrial areas,air pollution has poisoned the rain,which then falls on ponds and kills the frogs and toads that live there,In farming areas,the heavy use of chemicals oncrops has also killed off arrtphibians.Another factor is that air pollution has led to increasedlevels of ultraviolet (UV) light. This endangers amphibians, which seem to be especiallysensitive to UV light. And finally, scientists have discovered a new disease that seems tobe killing many species of arnpttibians in different parts of the world.All these reasons for the disappearance of amphibians are also good reasons for moregeneral concern. The destrriction of land, the pollcition of the air and the water, thechanges in our atmosphere, the spread of diseases-these factors affect human beings,too. Amphibians are especially sensitive to environmental change. Perhaps they are likethe canary （金丝雀）bird that coal miners once used to take down into the mines to detectpoisonous gases. When the canary became ill or died,the miners knew that dangerous gases were near and their own lives were in danger.Losing amphibians means losingA:knowledge about fatal human diseases.B:knowledge about air and water pollution.C:a chance to discover new medicines.D:an opportunity to detect poisonous gases.
Among the most popular books being written today are those which are usually classified as science fiction. Hundreds of titles are published every year and are read by all kinds of people.Furthermore, some of the most successful films in recent years have been based on science fiction stories.It is often thought that science fiction is a fairly new development in literature, but it can be found in books written hundreds of years ago. These books were often concerned with the presentation of some form of ideal society, a theme which is still often found in modern stories.Most of the classics of science fiction, however, have been written within the last hundred years. Books by writers such as Jules Verne and H.G. Wells, to mention just two well-knownauthors, have been translated into many languages. Modern science fiction writers don't write about men from Mars or space adventure stories. They are more interested in predicting the results of technical developments on society and the human mind; or in imagining future world which are a reflection of the world which we live in now. Because of this their writing has obviously political undertones.In an age where science fact frequently overtakes science fiction, the writers may find it difficult to keep ahead of scientific advances. Those who are sufficiently clear-sighted to see the way we are going, however, may provide a valuable lesson on how to deal with the problems which society will inevitably face as it tries to master its new technology.Which of the following statements can't prove that science fiction is very popular today 查看材料A.Hundreds of titles are published every year.B.All kinds of people love it.C.Some of the most successful films of recent years have been based on science fiction stories.D.Science fiction can be found in books written hundreds of years ago.
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