单项选择题

Which of the following is the most suitable title for the passage

A．The Evolution of Insects
B．Environment and Heredity
C．Education: The Influence of the Environment
D．The Instincts of Animals
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单项选择题
Before Sept. 11, the U.S. Congress had been unable to pass stricter immigration laws because.
A．they might have kept away foreign students and cheap labor
B．it was difficult to coordinate the efforts of the congressmen
C．education and business circles cared little about national security
D．resources were not available for their enforcement
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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