单项选择题
Vaccines for viral diseases are often produced from ______.
A.plant cells
B.human hormones
C.crop plants
D.bacteria
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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, 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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