单项选择题

we learn from the passage that coordinated efforts will be made by various U.S. government agencies to.

A．refuse the renewing of expired visas
B．ward off terrorist suspects at the border
C．prevent the forgery of immigration papers
D．limit the number of immigrants to the U.S.
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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
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.
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