单项选择题

People who are to be unhappy ______.

A．always consider things differently from others
B．usually are influenced by the results of certain things
C．can discover the unpleasant part of certain things
D．usually have a fault-finding habit

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单项选择题

Which of the following statement is not true according to the passage

A．We should pity such unhappy people.
B．Such unhappy people are Critical about everything.
C．If such unhappy people recognize the bad effects of the habit on themselves they may get rid of it.
D．Such unhappy people are also not content with themselves.

单项选择题

Which of the following statements is true

A．Altogether 95 different contaminants have been found in streams.
B．Nearly 80 percent of the streams surveyed contains only the familiar contaminants.
C．The most frequently detected contaminants are usually in low concentrations.
D．The average number of contaminants in each stream surveyed is seven.