单项选择题


Questions 18～21 are based on the following conversation.
What does the water purifier remove from the water

A．Salt.
B．Chemical pollutants.
C．Germs.
D．Minerals.
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单项选择题
The third paragraph is mainly about ______.
A．the difficulties of babies in learning to speak
B．babies’ intention to communicate
C．babies’ strong desire to communicate
D．the development of babies’ early forms of language
单项选择题
What seems to be Frank’s problem
A．He can’t find a quiet place to study in.
B．He can’t narrow down the choice of his research topics.
C．He can’t find enough information for his research paper.
D．He can’t sleep at night.
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