2. 外语
  3. Colds are caused by exposure to severe weather. Cold viruses can remain infectious for up to 10 hours.

Colds are caused by exposure to severe weather. Cold viruses can remain infectious for up to 10 hours.

admin2009-06-15  75
问题 Colds are caused by exposure to severe weather.
Cold viruses can remain infectious for up to 10 hours.
选项 A、Right
B、Wrong
C、Not mentioned
答案B
解析 见第四段首句。
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