单项选择题

He (comprehends) the theory of relativity.

A．learns
B．teaches
C．understands
D．investigates .
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单项选择题
You will find that the community has (experienced) great changes since you came here last.
A．undergone
B．experimented
C．submitted
D．sustained
单项选择题
Starfish (cling to) stones by the suction of their innumerable tube feet.
A．attract
B．destroy
C．swim over to
D．hold fast to
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