单项选择题

One quarter of the area（）by green trees.

A. are covered
B. is covered
C. covers
D. covering

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单项选择题
—Do you think their table tennis team will win the first place at the coming Asian Games —（）Ours is much stronger than theirs.

A. Of course
B. It depends
C. Don't mention it
D. By no means
单项选择题
The experiment has（）the possibility of the existence of any life on that planet, but it does not mean there is no life on other planets.

A. found out
B. pointed out
C. ruled out
D. carried out
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