单项选择题

______ evidence that language-acquiring ability must be stimulated.

A．It being
B．It is
C．There is
D．There being
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单项选择题
Grain production in the world is ______ , but still millions go hungry.
A．staggering
B．shrinking
C．soaring
D．suspending
单项选择题
You see the lightning ______ it happens, but you hear the thunder later.
A．the instant
B．for an instant
C．on the instant
D．in an instant
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