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
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.
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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