单项选择题

The best title for this passage might be ______.

A．Colds and Viruses
B．Ways to Avoid Colds
C．The Spread of Viruses
D．Hand Contact and Transmission of Viruses
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单项选择题
Man is most likely to be stricken with a cold if ______.
A．he often rubs his eyes or nose
B．he fails to expose the cold viruses to air
C．he visits his friend in a warm room
D．he shakes hands with a cold-sufferer
单项选择题
Up went the prices and ______.
A．the living standard came down
B．down did the living standard come down standard
C．came down the living standard
D．down came the living standard
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