单项选择题

The author did not know exactly when he was born because

A．he did not know who his mother was.
B．there was no written evidence of it.
C．his master did not tell his father.
D．nobody on his farm knew anything about it.

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单项选择题

The passage is mostly about

A．avalanches.
B．glaciers.
C．Peru.
D．mountains.

单项选择题

In this passage devastating means'

A．violently ruinous.
B．spectacularly interesting.
C．stunning.
D．unpleasant.