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.

单项选择题Although the sport is very popular, some people are still ______.

A．expanding its equipment
B．asking for instructions
C．afraid of going down the mountainsides
D．curious about the sport