单项选择题

Passage Two
Questions 29 to 32 are based on the passage you have just heard.

A．They became more popular.
B．They were more regulated.
C．They grew less honest.
D．They became better produced.
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单项选择题
A．Increasing upper body strength.B．Discussing popular climbing sites.C．Selecting the necessary equipment.D．Finding a climbing partner.
A．Increasing upper body strength.
B．Discussing popular climbing sites.
C．Selecting the necessary equipment.
D．Finding a climbing partner.
填空题
Going to bed earlier, you may be frustrated by body’s internal biological clock in keeping you ______.
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