单项选择题

Conrad and his group of AI researchers have been making enormous efforts to ______.

A．find a roundabout way to design powerful computers
B．build a computer using a clever network of switches
C．find out how intelligence developed in nature
D．separate the highest and most abstract levels of thought

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单项选择题

Which of the following, according to the author, should play the leading role in the solution of environmental problems

A．Legislation and government intervention.
B．The industry's understanding and support.
C．The efforts of environmental health professionals.
D．The cooperation of ecologists, environmental activists and conservationists.

单项选择题

Which of the following is true according to the last paragraph

A．Efforts should be exerted on pollution prevention instead of on remedial measures.
B．More money should be spent in order to stop pollution.
C．Ordinary citizens have no access to technical information on pollution.
D．Environmental degradation will be stopped by the end of this decade.