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
What can be inferred from the example of the ant-lion in the first paragraph
A．Instincts of animals can lead to unreasonable reactions of animals in a strange situation.
B．When it is engaged in a chain actions it cannot be interrupted.
C．Environment and heredity are two supplementary factors in the evolution of insects.
D．Along the lines of evolution heredity becomes less and environment more important.
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
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