A.Computer helps find the best program for mixing plants. |
B.Computer helps produce more crops. |
C.Computer helps protect against insects and diseases. |
D.Computer helps grow different plants. |
A.the kinds of crops to be planted together |
B.the way for different crops to be mixed |
C.both A and B |
D.either A or B |
A.whether we should grow cotton and tomato together |
B.how we should plant cotton and tomato together |
C.what will happen if we grow potato, instead of tomato, together with cotton |
D.how we can grow rice in the tomato field |
A.man power | B.seeds | C.time | D.land |
A.Computers can tell farmers how many plants can grow together. |
B.With the help of computers farmers don't have to do a lot of work. |
C.With the help of computers farmers can get better results. |
D.The change of one plant may cause a change in production. |
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C.our rivers are being polluted by waste from factories |
D.the ways early man protected the environment |
A.If we eat more vegetables, more food can be saved. |
B.In the past, there was no need for people to think about environmental protection. |
C.If we keep on cutting trees, forests will disappear. |
D.We shouldn’t take more and more fish out of the sea, or there will soon be no fish left. |
A.Man is cleverer than any other animal. |
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C.Modern fishing methods are helpful in our fishing industry. |
D.We should make more laws in order to survive. |
A.will never be used up | B.a(chǎn)re being polluted |
C.a(chǎn)re as plentiful as in the past | D.a(chǎn)re being used up very quickly |
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C.Waste treatment plants have found a new way to power themselves. |
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B.Through it more electricity can be created and water can be cleaned better. |
C.It has already changed the way that wastewater is treated all over the world |
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A.Because it is co-friendly and treats wastewater more effectively. |
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C.their cells continue to renew themselves |
D.they develop arthritis and Alzheimer’s |
A.a(chǎn)lligators are in danger in the wild because of the threat from man, pollution and other animals |
B.it is widely accepted that humans have a fixed lifespan |
C.there exists an age gene which may control ageing |
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A.live for a period of time without a fixed end |
B.live without a clear aim |
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D.live without being fully grown |
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