单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．He is very quiet.
B．He should give more than one series of talks.
C．He gives amusing lectures.
D．He lectures only to the serious students.
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单项选择题
A．People’s health.B．The end of the world.C．People’s lives and futures.D．The Great Depression of 1929.
A．People’s health.
B．The end of the world.
C．People’s lives and futures.
D．The Great Depression of 1929.
单项选择题
A．They defend the bone against viruses.B．They break down bone tissue.C．They prevent oxygen from entering the bone.D．They connect the bone to muscle tissue.
A．They defend the bone against viruses.
B．They break down bone tissue.
C．They prevent oxygen from entering the bone.
D．They connect the bone to muscle tissue.
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