单项选择题

It is not clear whether the increase in reports is stemmed from greater human activity or is simply the result of more surveys.

A．flows
B．comes
C．derives
D．originates
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单项选择题
Before you decide on a vocation, it might be a good idea to consult a few good friends.
A．career
B．holiday
C．plan
D．research
单项选择题
Woman: I am thinking of taking three language courses next semester. Man: I think it's advisable not to bite off more than you can chew. Question: What does the man mean
A．The woman should take more than three courses.
B．The woman should take less than three courses.
C．It is easier to chew than to bite.
D．It is easier to bite than to chew.
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