单项选择题

Without air, （）no wind or rain.

A. there would be
B. there will be
C. there have been
D. there is

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单项选择题
Sometimes we are asked （）we think the likely result of an action will be.

A. that
B. whether
C. what
D. which
单项选择题
To improve the （）is regarded as a good method to increase the farmer's income in the south part of the country.

A. sewage
B. drainage
C. aqueduct
D. archway
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