题目内容

Universal peace would be（）to all mankind.

A. beneficial
B. valid
C. advisable
D. worthy

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大量的秸秆燃烧也是造成雾霾天气的重要原因之一。（)

The present difficulties（）from our failure to deal with the problem when it first arose.

A. step
B. stem
C. steer
D. sponsor

We have not（）information to state the exact damage.

A. abundant
B. sufficient
C. plenty
D. efficient

在无人遥控潜水器领域，美国和日本等国家处于领先地位。（)