单项选择题

A．It requires a great deal of time.
B．It requires the spirit of dedication.
C．It requires the spirit of cooperation.
D．It requires all the representatives to write down their names and telephone numbers.
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填空题
The researchers decided to study the effects on breathing first because __________ might appear in a later period of time.
单项选择题
A．He was thinking of the money he could have.B．He could not see very well.C．Pulling in the chain was hard work.D．The bottom of the boat was covered by the golden chain.
A．He was thinking of the money he could have.
B．He could not see very well.
C．Pulling in the chain was hard work.
D．The bottom of the boat was covered by the golden chain.
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