单选题
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
【正确答案】
B
【答案解析】
[分析] 细节题。参见原文：The camper may always discard layers of such clothing if too warm．
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