如果自然界中的各种细菌和真菌都不存在，那么下列说法正确的是

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问题选择题

如果自然界中的各种细菌和真菌都不存在，那么下列说法正确的是 [ ]

A．生物尸体极易腐烂

B．植物、动物大量繁殖

C．人类不再会患病

D．植物制造有机物的原料会发生困难

答案

答案：D

填空题

词汇运用

1．You need warm clothes to ________(保护) you against cold.

2．It is impossible to make up the ________(失去的) time.

3．I am afraid you can't sit here. sir. This seat is ________(预订的)．

4．Famers used to ________(捕猎) us and the rhinos.

5．He ________(申请) for a job as an English teacher.

6．I wrote a letter ________(建议) that he should carry out the plan at once.

7．It ________(包含) a powerful drug which affects mosquitoes.

8．The new government will come to ________(掌权) next month.

9．Our city will have ________(有效的) measures to stop the pollution.

10．The dog just ________(咬) me in the leg.

选择题

—Do you know our city at all?

—Yes, quite well, this is the fourth time I _____ here. [ ]

A. had been

B. have been

C. was

D. am