A.Around 30000 | B.Forty |
C.Around 29960 | D.Around 40 |
A.food shortages in poor country | B.food shortages in rich country |
C.increase of world population | D.disaster in world politics |
A.Some plants have relative immunity to a great many diseases. |
B.Some other plants have a susceptibility to a great many diseases. |
C.The tolerance of a particular plant changes as the growing conditions change. |
D.A blight can be a national infection. |
A.infect people |
B.be prevented by inoculation(接種疫苗) |
C.be prevented by killing insects |
D.be prevented by improving the growing conditions |
A.Fungus | B.Mold | C.Smut | D.Rust |
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Environmental problem | Cause | Damage |
Global (76)_____- | Increasing carbon dioxide levels | Making it difficult for various plants and animals to (77) ______ |
(78)______ depletion | Releasing CFCs | Various problems such as the harmful effects of UV rays |
Water (79) _____ | ·Throwing (80)_____ into water ·Adding harmful (81) _____into water | Endangering wild animals’ lives Endangering humans’ (82) ______ |
The loss of natural(83)____ | ·Increasing (84) _____ ·Various human activi- ties such as (85)_____, cutting down forests and mining | Endangering the next generation |
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A.Three | B.Two | C.One | D.four |
A.your computer will save the important information when its hard drive crashes |
B.Your computer might lose all the information it stores when it crashes . |
C.You must not put in much software. |
D.You’d better use 128 MB of Ram if you run Windows NT. |
A.the Tips You must Follow |
B.How to Start out with a Computer |
C.How to Use your PC Better |
D.How to Keep Your PC Stable |
A.System unsteadiness | B.personal computer |
C.To perform well | D.Getting a new PC |
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A.Japan | B.the United States | C.Western Europe | D.the industrialized world |
A.Take care of roads. | B.Be used as medicine. |
C.Used as underground pipeline cleaner. | D.Take up jobs of building construction. |
A.Greatest changes in future robots. | B.The field of artificial intelligence. |
C.Machines of a new kind of robots. | D.Practical application in industry. |
A.It is possible that robots will be able to think like human beings. |
B.It is sure that robots might be able to manage battlefields. |
C.There is no doubt that computers can design and make robots of their own. |
D.It is proved that computers can’t reason like human beings. |
A.Future robotic technology might cause dangers. |
B.Future robotic technology might make people too clever. |
C.Future robotic technology might help to do all dangerous jobs. |
D.Future robotic technology might not survive because of its shortage of energy. |
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