单项选择题

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单项选择题
A. Cold. B. Viruses. C. Infection. D. Wet.
A. Cold. B. Viruses. C. Infection. D. Wet.
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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