单项选择题

Your first contact with an employer will be either to apply for a known job opening or to find out if any jobs are ______.

A．opened
B．hired
C．available
D．variable
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单项选择题
It has been estimated that the earth's surface temperature has increased ______ one quarter to three fourths of a degree since 1850.
A．by
B．at
C．to
D．with
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