单项选择题

案例分析题（62）处应填写（）

A．lack
B．supply
C．necessity
D．need

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单项选择题

What can be said about the experiments at Rocky Mountain Arsenal （）.

A．They have no practical value in earthquake prevention
B．They may have practical value in earthquake prevention
C．They are certain to have practical value in earthquake prevention
D．The article does not say anything about their practioal value earthquake prevention

单项选择题

When a population doubles, the country involved needs twice as much of everything, including（）.

A．hospitals and medicines
B．schools and students
C．food and manpower resources
D．all of the above

案例分析题 （62）处应填写（）

案例分析题（62）处应填写（）