单项选择题

The Salk polio vaccine provides immunity from that disease.

A．security
B．publicity
C．liability
D．help
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He covered the fish lavishly with sauce.
A．sparingly
B．completely
C．generously
D．simply
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The jungles of the sub-Sahara, afflicted with tse-tse and mosquitos, is an unhealthy are
A．A. requiring inoculation againstB. heated byC. flooded byD. plagued by
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