单项选择题

An old lady (夫人，女士) turned ______ the air-hostess (空中小姐) for help.

A. around
B. to
C. down
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单项选择题
______of the students is able to answer the question.
A. None
B. Nobody
C. No one
单项选择题
______ trees are cut down in the forests every year.
A. Thousands
B. Thousands of
C. Thousand of
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