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Questions 29 to 31 are based on the passage you have just heard.

A．7 years.
B．9 years.
C．12 years.
D．16 years.

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What can we infer about American doctors from the case of the poisonous mushrooms

Passage TwoQuestions 29 to 31 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。