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【单选题】
下列说法正确的是（ ） ①原命题为真，它的否命题为假 ②原命题为真，它的逆命题不一定为真 ③一个命题的逆命题为真，它的否命题一定为真 ④一个命题的逆否命题为真，它的否命题一定为真．A.
①②
B.
②③
C.
③④
D.
②③④
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【简答题】结构数据模型的三个组成部分是数据结构、数据操作和____。
【单选题】It can be inferred from the last paragraph that
A.
women are often involved in politics in Germany.
B.
in Germany, there are now some female leaders, including Merkel.
C.
Merkel becomes a chancellor because she is no longer a girl.
D.
it does need a lot to become a female chancellor in Germany.
【单选题】We all associate colors with feeling and attitudes. In politics dark blue often means 'tradition', and red means 'social change'. But blue can also mean sadness (I'm feeling blue), white is often for ...
A.
the association of day and night with passivity and action in ancient time
B.
the association of black with funerals in western Europe
C.
the association of white with purity in some countries
D.
the association of red with joy in China
【简答题】在Visual FoxPro中，相当于主关键字的索引是( )。 A) 主索引 B) 普通索引 C) 唯一索引 D) 排序索引
【简答题】在Visual FoxPro中，相当于主关键字的索引是A）主索引 B）普通索引 C）惟一索引 D）排序索引
【单选题】All too often, the national dreams that drive politics ______ on wholly irrational character.
A.
come
B.
keep
C.
take
D.
turn
【简答题】红楼人物关系连连看
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