单项选择题

Questions 19 to 22 are based on the conversation you have just heard.

A. They defend the bone against viruses.
B. They prevent oxygen from entering the bone.
C. They break down bone tissue.
D. They connect the bone to muscle tissue.
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单项选择题
A. He prefers staying at home because the bus is too late.B. He prefers staying at home because he doesn’t like to travel.C. He prefers taking a bus because the plane makes him nervous.D. He prefers traveling with the woman.
A. He prefers staying at home because the bus is too late.
B. He prefers staying at home because he doesn’t like to travel.
C. He prefers taking a bus because the plane makes him nervous.
D. He prefers traveling with the woman.
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