单项选择题

Questions 18～21 are based on the following conversation. The filter will probably best clean water obtained from which of the following

A．Factories.
B．Inland seas.
C．Mountain streams.
D．Drug companies.
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单项选择题
The author’s purpose in writing the second paragraph is to show that children ______.
A．learn to speak by listening
B．are passive in the process of learning to speak
C．are born cooperative
D．usually obey without asking questions
单项选择题
Why does the author mention the mother (Para. 1) and father (Para. 1)
A．To point out that parents can teach their children statistics.
B．To present the background of statistics in a humorous and understandable way.
C．To introduce inferential statistics.
D．To explain that there are different kinds of variables.
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