单项选择题

He sat ______ his head, trying to think of the answer.

A．scrapping
B．screwing
C．scraping
D．scratching
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单项选择题
Ignorant people were ______ of Columbus's theory that the earth was round.
A．mysterious
B．cynical
C．skeptical
D．tolerant
单项选择题
Mainstream economists profess much puzzlement over the failure of the rate of productivity growth to ______ so far in this decade.
A．accelerate
B．prevail
C．aggregate
D．precede
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