单项选择题

The author believes that everything in your pack should ______.

A．be lightweight
B．serve an important purpose
C．serve several purpose
D．keep the pack warm
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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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