单项选择题

Questions 23 to 25 are based on the conversation you have just heard.

A. Keeping the body straight.
B. Keeping the feet to the floor.
C. Bending the body at the waist.
D. Bending the elbows as low as possible.

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单项选择题

A. It is not intentional.
B. It is extended deliberately.
C. There is no doubt that it is immense.
D. It won’t last for long.

填空题

37（）

Questions 23 to 25 are based on the conversation you have just heard. 您的浏览器不支持 audio 元素。