单项选择题

The 17 th century English physician William Harvey discovered the _______ of the blood.

A．circulation
B．Circus
C．circumstance
D．circuit
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单项选择题
Their endeavor and _______ to get ahead have produced some excellent results.
A．assassination
B．ammunition
C．auction
D．ambition
单项选择题
If the president makes his usual speech, it will _______ the ceremony by twenty minutes.
A．magnify
B．prolong
C．delay
D．exceed
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