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
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单项选择题
Caracas has been called the Los Angles of South America; at ______ they look exactly the same.
A．short notice
B．first sight
C．first impression
D．first appearance
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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