单项选择题

The underlined word "impair" at the end of Paragraph 2 can best be replaced by ______.

A．neglect
B．weaken
C．come together with
D．be superior to
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单项选择题
The underlined phrase puts it down to (Para. 3) is closest in meaning to ______ .
A．attributes it to
B．finds it a reason for
C．sums it up as
D．compares it to
单项选择题
According to the passage, Brazil has cut back its population growth ______
A．by educating its citizens
B．by developing TV programmes
C．by careful family planning
D．by chance
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