单项选择题

For nearly 50 years, Spock has been a ______ author writing 13 books including an autobiography and numerous magazine articles.

A．prevalent
B．precautious
C．prospective
D．prolific
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单项选择题
Researchers find it hard to ______ the two sets of figures.
A．associate
B．correspond
C．correlate
D．respond
单项选择题
He cannot ______ the fact that he was late again for the conference at the university yesterday.
A．contribute to
B．account for
C．identify with
D．leave out
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