英.语单项选择考试卷模拟考试题_15

1、姓名：_ 班级：_ 学号：_-密-封 -线- 英.语单项选择考试卷模拟考试题考试时间：120分钟 考试总分：100分题号一二三四五总分分数遵守考场纪律，维护知识尊严，杜绝违纪行为，确保考试结果公正。1、across the united states, scientists are mounting what may become the most innovative agricultural research drive since the 1920s,when hybrid corn was developed. surprisingly, the new genetic revolut

2、ion is not taking place in americas fields.instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants.this genetic engineering may prove the biggest boon to agriculture since plant breeding began.the new concepts grew out o

3、f the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. plant cells, however, are far more complex than bacteria, and it will probably take many years for todays encouraging laboratory results to have a major impact on the farm. in fact t

4、he payoff may not come until the next century.but although biotechnologists are still in the earliest phases of this new field of science, they are already actively exploring ways to redesign plants so they will use sunlight more efficiently, resist viruses and other pests, grow in hot or dry areas,

5、 in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. in addition, scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding-a potato-tomato combination, for example.the new te

6、chnology holds the promise of virtually limitless horizons in food production. only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot-all may be with us one day.according to this passage ,the new generic revol

7、ution involves （ ）a.experiments on plants in the fieldsb.developing strains of hybrid cornc.breeding plants in test tubesd.rearranging plant genes in laboratories2、across the united states, scientists are mounting what may become the most innovative agricultural research drive since the 1920s,when h

8、ybrid corn was developed. surprisingly, the new genetic revolution is not taking place in americas fields.instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants.this genetic engineering may prove the biggest boon to agr

9、iculture since plant breeding began.the new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. plant cells, however, are far more complex than bacteria, and it will probably take many years for todays encouraging l

10、aboratory results to have a major impact on the farm. in fact the payoff may not come until the next century.but although biotechnologists are still in the earliest phases of this new field of science, they are already actively exploring ways to redesign plants so they will use sunlight more efficie

11、ntly, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. in addition, scientists have had early success in making wholly new plants that are unavailable by conventional pla

12、nt breeding-a potato-tomato combination, for example.the new technology holds the promise of virtually limitless horizons in food production. only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot-all may be w

13、ith us one day.the overall effect of this passage is likely to make the reader feel （ ）a.enthusiastic about biotechnologyb.very wary about genetic engineeringc.reluctant to try new plant combinationsd.alarmed about limitless experiments3、across the united states, scientists are mounting what may bec

14、ome the most innovative agricultural research drive since the 1920s,when hybrid corn was developed. surprisingly, the new genetic revolution is not taking place in americas fields.instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes

15、 of crop plants.this genetic engineering may prove the biggest boon to agriculture since plant breeding began.the new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases. plant cells, however, are far more complex th

16、an bacteria, and it will probably take many years for todays encouraging laboratory results to have a major impact on the farm. in fact the payoff may not come until the next century.but although biotechnologists are still in the earliest phases of this new field of science, they are already activel

17、y exploring ways to redesign plants so they will use sunlight more efficiently, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the air. in addition, scientists have had early su

18、ccess in making wholly new plants that are unavailable by conventional plant breeding-a potato-tomato combination, for example.the new technology holds the promise of virtually limitless horizons in food production. only imagination sets the limits: frost-resistant wheat, tropical potatoes, saltwate

19、r rice, a plant producing a combination of a pea and a carrot-all may be with us one day.from the passage we understand that conventional plant breeding produced （ ）a.a potato-tomato hybridb.new plant technologyc.self-fertilizing plantsd.less dramatic results than the new technology4、across the unit

20、ed states, scientists are mounting what may become the most innovative agricultural research drive since the 1920s,when hybrid corn was developed. surprisingly, the new genetic revolution is not taking place in americas fields.instead, it is occurring in biology laboratories, for it involves the del

21、iberate manipulation in test tubes of the genes of crop plants.this genetic engineering may prove the biggest boon to agriculture since plant breeding began.the new concepts grew out of the bioengineering of bacteria for the production of such things as human hormones and vaccines for viral diseases

22、. plant cells, however, are far more complex than bacteria, and it will probably take many years for todays encouraging laboratory results to have a major impact on the farm. in fact the payoff may not come until the next century.but although biotechnologists are still in the earliest phases of this

23、 new field of science, they are already actively exploring ways to redesign plants so they will use sunlight more efficiently, resist viruses and other pests, grow in hot or dry areas, in saline soils or in the presence of pesticides, and perhaps even make their own fertilizer out of nitrogen in the

24、 air. in addition, scientists have had early success in making wholly new plants that are unavailable by conventional plant breeding-a potato-tomato combination, for example.the new technology holds the promise of virtually limitless horizons in food production. only imagination sets the limits: fro

25、st-resistant wheat, tropical potatoes, saltwater rice, a plant producing a combination of a pea and a carrot-all may be with us one day.what will be one effect of the new biotechnology on plants（ ）a.they will grow anywhere in the world.b.some will be able to grow in salty soils.c.they will become po

26、isonous to pests.d.using nitrogen from the air they will be able to cross-fertiliz5、across the united states, scientists are mounting what may become the most innovative agricultural research drive since the 1920s,when hybrid corn was developed. surprisingly, the new genetic revolution is not taking

27、 place in americas fields.instead, it is occurring in biology laboratories, for it involves the deliberate manipulation in test tubes of the genes of crop plants.this genetic engineering may prove the biggest boon to agriculture since plant breeding began.the new concepts grew out of the bioengineer

28、ing of bacteria for the production of such things as human hormones and vaccines for viral diseases. plant cells, however, are far more complex than bacteria, and it will probably take many years for todays encouraging laboratory results to have a major impact on the farm. in fact the payoff may not come until the next century.but although biotec