单项选择题

Grain was the agricultural base for each of the ancient civilizations.

A．many
B．just one
C．several
D．every one
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单项选择题
The caliber of F. Scott Fitz gerald's writing was reassessed by literary critics in the 1950's.
A．idealism
B．creativity
C．quality
D．imagery
单项选择题
When hummingbirds fly,their wingbeats are so rapid that the wings seem blurred.
A．tiny
B．fragile
C．indistinct
D．inexhaustible
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