单项选择题

Passage Two
Questions 30 to 32 are based on the passage you have just heard.

A. Cold. B. Viruses. C. Infection. D. Wet.
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单项选择题
A. To make them longer. B. To avoid accidents. C. To save materials. D. To improve techniques.
A. To make them longer. B. To avoid accidents.
C. To save materials. D. To improve techniques.
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