单项选择题

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

A．Forty hours.
B．Less than forty hours.
C．About seventy hours.
D．Less than twenty-five hours.

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When you’re weight training, the qualifications of instructors are important because injuries might be caused by______.

单项选择题

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