单项选择题

Questions 11 to 18 are based on the conversations you have just heard.

A．The pear.
B．The weather.
C．The sea food.
D．The cold.
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单项选择题
A．threeB．twoC．fiveD．six
A．three
B．two
C．five
D．six
填空题
Mouth -to -mouth resuscitation must not be stopped for more than ______ in adults, until the victim is breathing on his own.
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