答案为：
A. upper—class
B. lower．class
C. low-class
D. the rest
According to the passage，which of the following Can be found in areas with quite different
A. Reef corals．
B. Penguins．
C. Bears．
D. Camels．
The“pleasant day”to which the author refers was the period-when we_________．
A. did not feel guilty aboutwasting time
B. were able to act of ourown free will
C. seemed to have better weather
D. did not have SO manyenemies
答案为：
A. that
B. which
C. whether
D. if
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