单项选择题

Which of the following can best summarize the main idea of the text

A．It's about the relationship between primitive skiing and the modern ski touring.
B．The best place to do ski touring is Norway.
C．Ski touring is a demanding sport.
D．Ski touring is a fast-growing sport in the US.
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单项选择题
What is the reason for the going down of the population in rich countries
A．The people there have a bright future.
B．The people there have a splendid past.
C．The government carries out a family plan.
D．The government controls the growth rate.
单项选择题
Why will the population in poorer countries increase
A．Because they need more labor to support the family.
B．Because the people have the habit to have a big family.
C．Because the people there are poorer.
D．Because the people there want to be rich.
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