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
Compared with monogamy, polygamy is practiced ______.
A．by less people
B．mostly by young people
C．more commonly
D．by people who have many sisters or brothers
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
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