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 connect the bone to muscle tissue.
D．They break down bone tissue.
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单项选择题
A．Possibly not.B．Yes, of course.C．Definitely not.D．Not mentioned.
A．Possibly not.
B．Yes, of course.
C．Definitely not.
D．Not mentioned.
单项选择题
A．Controlled drinking helps people keep their wits as they age.B．Heavy drinking is not necessarily harmful to one’s health.C．Alcohol helps develop people’s intelligence.D．Drinking, even moderately, may harm one’s health.
A．Controlled drinking helps people keep their wits as they age.
B．Heavy drinking is not necessarily harmful to one’s health.
C．Alcohol helps develop people’s intelligence.
D．Drinking, even moderately, may harm one’s health.
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