单项选择题

When it is warm, campers ______.

A．wear cotton undershirts
B．throw away some unnecessary clothes
C．do not need any kind of tents
D．wear down-filled jackets
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单项选择题
It is implied that lightweight aluminum-frame packs ______.
A．are better than woven pack basket
B．are better than wool-filled sleeping bags
C．are as good as canvas tents
D．are as good as down-filled sleeping bags
单项选择题
According to the Passage, whether it is cold or warm, ______.
A．the right kinds of tents are the most important
B．the right kinds of clothes are the most important
C．it is the most important to keep warm and safe
D．it is important to bring a down-filled sleeping bag
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