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
Vaccines for viral diseases are often produced from ______.
A．plant cells
B．human hormones
C．crop plants
D．bacteria
单项选择题
According to the passage, if you were camping in 10℃ weather and the temperature dropped to 10℃ below zero, you could compensate for this by______.
A．sleeping in a tent with special layers of clothing
B．sleeping in a tent on the side of a hill
C．sleeping on the side of a hill
D．sleeping on the side of a hill out of the wind
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