单项选择题

According to this passage, an assumption is ______.

A．something that everyone knows
B．the idea the writer wants to emphasize
C．the reader's knowledge about the topic
D．foundation of the writer's reasoning
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单项选择题
The head of homeland security indicated that ______.
A．the worry about terrorist attack was totally unnecessary
B．the government had been well prepared for possible security problem
C．the government bad been too optimistic about its anti-terrorism efforts
D．the legislators usually could do nothing except making empty talks
单项选择题
The research is conducted in order to ______.
A．explore how nose works
B．find ways to treat deformed noses
C．study the relation between nostrils and smelling power
D．find ways to deal with smelling problems
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