单项选择题

The word "boon" at the end of paragraph 1 is closest in meaning to ______.

A．success
B．accomplishment
C．dream
D．benefit
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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
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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