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
--Whom do you want to see at the moment --The man（）Mr Zhang.

A. calls himself
B. you call
C. calling himself
D. is called
单项选择题
What do you think of the book Oh, excellent. It's worth（）a second time.

A. reading
B. being read
C. to read
D. to be read
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