单项选择题

Climate change will greatly （） wheat and rice production if nations don't take steps now.

A．fall
B．leak
C．lack
D．reduce

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单项选择题
By no means （） to her parents.

A．this is the first time has she lied
B．this is the first time does she tell a lie
C．is this the first time she has lied
D．is this the first time she was lying
单项选择题
The police are trying to find out the （）of the woman killed in the traffic accident.

A．evidence
B．recognition
C．identity
D．status
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