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
From the passage we understand that conventional plant breeding produced ______.
A．a potato-tomato hybrid
B．new plant technology
C．self fertilizing
D．less dramatic results than the new technology
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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