单项选择题

All of the following aspects of backpacking are discussed in the passage except ______.

A．wearing several layers of clothing
B．getting maximum use from your pack material
C．improving the warmth of your sleep
D．forecasting the weather
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单项选择题
According to the passage, it would be more advantageous to pack ______.
A．a light sleeping hag, pants and shorts, a heavy jacket, and a shirr
B．a light sleeping bag, two pairs of pants, and a heavy jacket
C．a light sleeping bag, two pairs of pants, and a light sweater and shirt
D．a light sleeping bag, pants and shorts, and a light sweater and shirt
单项选择题
Why is it warmer on the side of a hill than on the valley floor
A．Because warmer air lifts up and off the valley floor, especially on clear nights.
B．Because there is difference between the temperature.
C．Because cold wind blows down to the valley.
D．No information is mentioned in the passage.
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