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【单选题】
设栈的顺序存储空间为S(1: 50),初始状态为top=0。现经过一系列入栈与退栈运算后,top=20,则当前栈中的元素个数为A.
20
B.
19
C.
30
D.
29
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举一反三
【简答题】Without your help, I ______ (not, succeed) in catching that big fish.
【单选题】有关构成社区的基本要素描述，正确的是
A.
社区中人口的密度是构成社区的第一要素
B.
社区人口的性别比例是构成社区的第一要素
C.
一个社区的人口越多，越容易完成社区的目标
D.
人是社会生活的主体，是构成社区的第一要素
E.
社区中一定数量的人口彼此间相对独立没有联系
【单选题】concept
A.
join or combine
B.
idea; thought
C.
an instance of buying or selling something; a business deal
D.
succeed in catching or seizing
【单选题】In the author's opinion, the major cause of many people to make U-turns is that ______.
A.
they have eaten some drug which can change their identities.
B.
they become to consider the connections between different things.
C.
they want to succeed in catching some political opportunities.
D.
they have been stimulated by some big changes in their life experiences.
【单选题】Blind people meet with countless difficulties in their lives but, happily, they succeed in coping with many of them so they can live near-normal lives.
A.
catching up with
B.
dealing with
C.
keeping up with
D.
cooperating with
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