单项选择题

Social workers often use ______ in their research.

A．frauds
B．narrations
C．refutations
D．questionnaire
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单项选择题
For the cast of this mighty epic, Vidal ______ his brilliant family and social connections, which included Mary Pick ford, Marion Davies and throngs for the political world.
A．drew off
B．drew out
C．drew up
D．drew on
单项选择题
In view of the depression of the national economy, there are plans to ______, a much greater harvest from the timber resource.
A．excel
B．expel
C．expire
D．extract
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