单项选择题

It can be inferred from the passage that before Sept. 11, aliens with expired visas.

A．might have them extended without trouble
B．would be closely watched by FBI agents
C．might stay on for as long as they wished
D．would live in constant fear of deportation

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单项选择题

Based on the example provided in the passage, we can tell that when a spider is removed to a new position where half of a net has been made, it will probably.

A．begin a completely new net
B．destroy the half-made net
C．spin the rest of the net
D．stay away from the net

单项选择题

Terrorists have obviously taken advantage of ______.

A．the legal privileges granted to foreigners
B．the excessive hospitality of the American people
C．the irresponsibility of the officials at border checkpoints
D．the low efficiency of the Immigration and Naturalization Service