单项选择题

Do earthquakes （） often in North America

A. break
B. break out
C. happen to
D. occur

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单项选择题

I like （）the clouds at sunset because it seems relaxing.

A. watch
B. to watch
C. watched
D. watching

单项选择题

不同的一项是（）

A. however
B. narrow
C. shallow
D. snowy

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