单项选择题

A．The woman knows the professor has been busy.
B．The woman regrets having taken up much of the professor’s time.
C．The woman has trouble getting along with the professor.
D．The woman knows the professor has run into trouble.
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单项选择题
A．They want to sleep well at night.B．Their parents want them to do so.C．They fall far behind the others.D．They know that training is very important.
A．They want to sleep well at night.
B．Their parents want them to do so.
C．They fall far behind the others.
D．They know that training is very important.
单项选择题
A．It has been increasing since the Ice Age.B．It affected the growth of trees.C．It is determinated by the chemicals in the air.D．It follows a certain cycle.
A．It has been increasing since the Ice Age.
B．It affected the growth of trees.
C．It is determinated by the chemicals in the air.
D．It follows a certain cycle.
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