单项选择题

We tried to settle the problem with them as soon as possible, but they seemed to ______ sincerity.

A．lack of
B．be lack of
C．lack in
D．be lacking in
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单项选择题
When our university laboratory bought this microscope we were given a one year's
A．reservation
B．security
C．proof
D．guarantee
单项选择题
It is very likely that the Martian will also be ______ to underground existence, for conditions are much more equable underground.
A．adopted
B．acquired
C．admitted
D．adapted
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