单项选择题

Passage One Questions 11 to 14 are based on the following passage:

A．Less than 40 minutes.
B．From 40 to 70 minutes.
C．At least 40 minutes.
D．More than 70 minutes.

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单项选择题

单项选择题

Passage One Questions 11 to 14 are based on the following passage: 您的浏览器不支持 audio 元素。