单项选择题

In ______ times human beings did not travel for pleasure but to find a more favourable climate.

A．prime
B．primitive
C．primary
D．preliminary
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单项选择题
A good scientist ______ into all aspects era problem in order to find solutions.
A．pricks
B．pokes
C．probes
D．peers
单项选择题
If each manager makes his usual speech, the meeting will be ______ for forty-five minutes.
A．prolonged
B．expanded
C．delayed
D．exceeded
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