单项选择题

Scientists call on us to ______ nature and become better recyclers.

[A] learn of
[B] learn to
[C] learn about
[D] learn from

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单项选择题

— Harry treats his secretary badly. — Yes, he seems to think that she's the ______ important person in the office.

[A] less
[B] least
[C] more
[D] most

单项选择题

Alice was about to ______, when she suddenly found an answer to the question.

[A] make up
[B] look up
[C] turn up
[D] give up

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