单项选择题

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

A．They are very friendly.
B．They are some nice people.
C．They are very quiet.
D．They are not sociable.
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单项选择题
A．The patient is physically ill.B．The patient is mentally ill.C．The patient is basically fit.D．The patient is nervous.
A．The patient is physically ill.
B．The patient is mentally ill.
C．The patient is basically fit.
D．The patient is nervous.
填空题
Today atmospheric carbon dioxide concentrations are 31 percent more than that of______.
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