单项选择题

The old bridge is not strong enough to allow the ______ of heavy vehicles.

A．passage
B．route
C．tunnel
D．pressure
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单项选择题
Citizens of developed and developing nations alike face dangers from （） medicines; they pose a terrible hazard to public health.

A．distinctive
B．proliferating
C．fraudulent
D．getting along
单项选择题
To have a knowledge-based economy and a scientifically ______ population, developing countries must invest in fundamental science and blue skies research.
A．moderate
B．obsolete
C．literate
D．desperate
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