单项选择题

From the second paragraph, we know that the ski touring ______.

A．isn't very easy to learn
B．can be carried out indoors
C．doesn't have the limitations of energy and health
D．is a healthy activity which can be enjoyed by a family

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单项选择题The underlined word demanding probably means ______.

A．requiring more energy
B．easy to learn
C．enjoyable
D．dangerous

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.