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
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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
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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