题目内容

Complete the sentences with suitable expressions from the collocation box. Make changes where necessary. Sometimes more than one collocation is possible.Verbs which often go before:reputation: give / have / ruinAdjectives which often go before:competition: intense/ fair /freeAdverbs which often go with:value : highly/ greatly/ sociallycomplain:loudly/bitterly / constantly1 Practicing good corporate social responsibility (企业社会责任) can usually _______ a company a good ___________.2 The Chinese __________________ social harmony and smoothness of relationships within the family.3 To protect consumers’ rights and ensure ______________, the government is careful to work out the laws about online shopping.4 He informed me of the ___________________ between students and how they work hard to hopefully go to a famous university.5 For long, the Chinese people ______________________ of being afraid of losing face or lian in Chinese.6 I just can’t stand people who ________________________ in public places.

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设集合A={1,2,3,4},B={2,4,6,9},那么集合A,B的对称差A⊕B=( ).

A. {1,3}
B. {2,4,6}
C. {1,3,6,9}
D. {1,2,3,4,6,9}

设有集合A,B,下面的说法哪个是错误的( )

A. |A∩B| ≤ min(|A|, |B|)
B. |A-B| ≤ |A|-|B|
C. |A-B| ≥ |A|-|B|
D. |A⊕B| = |A|+|B|-2|A∩B|

设A表示以101开始的长度为6的位串集合,B表示以00结尾的长度为6的位串集合。那么,集合|A∩B|= ____。

如果|A| = n,则 |P(A)| =( )。【注:P(A)代表集合A的幂集】

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