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【单选题】
气孔的开张与( )有关。A.
副卫细胞的有无
B.
保卫细胞的大小
C.
保卫细胞的细胞壁的厚薄不均
D.
保卫细胞的形状
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【简答题】文学活动的对话性结构
【简答题】在整个北半球范围内,从南到北构成了大气的“三圈环流”,其中:( )( )是正环流( )是反环流
【简答题】文学活动的对话结构
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【单选题】As a result of the epidemic of AIDS in Africa, ______.
A.
the life span for most of the people has been reduced by 40 years
B.
most young people have been infected with human immunodeficiency virus
C.
people will have to learn to live with the disease for over 50 years
D.
the achievements made in preserving people's health in the past will be wiped off
【简答题】A. Because he thinks he can use the material in class. B. Because he knows some of the people in the program. C. Because he already saw the first three episodes. D. Because he is especially interested...