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.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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A.to encourage people to recycle their rubbish |
B.to introduce a recycling system for high rises |
C.to describe the use of computer technology in recycling |
D.to explain the need for rubbish collection in high rises |
A.you'll soon be living in a cleaner building |
B.rubbish chutes will become out of date before long |
C.you won't wait long for your turn to recycle rubbish |
D.it won't be long before you'll have to recycle your rubbish |
A.lock the other floors' chute doors | B.check if the container is full |
C.press the correct button | D.break up the rubbish |
A.it reduces the cost of recycling | B.it saves time and space |
C.it saves money for people living in high rises | |
D.it makes better use of the existing recovery equipment |
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