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7. (2010·南京模擬) So far I haven’t adapted to the fast ______ of the modern life in Tokyo.

A. step      B. style     C. pace        D. manner

試題詳情

6.(2010·濟(jì)南模擬)Please read the _______ on the bottle and take the right amount of medicine.

A. explanations    B. descriptions   C. instructions    D. introductions

試題詳情

5.(2010·蕪湖模擬)In the     of proof,  the police could not take action against the man.

A.lack    B.shortage    C.a(chǎn)bsence     D.failure

試題詳情

4.(2010·沈陽(yáng)模擬) Despite such a big difference in ____ towards what one eats, there is no doubt that people

in the west regard the Chinese food as something special.

A. point     B. idea   C. attitude      D. sight

試題詳情

3.(2010·銀川模擬)Although I had read the book assigned by the professor several times , it didn’t make any _____  to me.

A.meaning    B.importance     C.sense    D.significance

試題詳情

2.(2010·溫州模擬)   Typhoon Morakot has caused great _________ to the local economies in Wenzhou.

            A. injury      B. wound    C. ruin      D. damage

試題詳情

1.(2010·天津模擬)The increase in home computers means that families have much easier     to information.

A.measure      B.a(chǎn)ccess     C.way    D.method

試題詳情

9.設(shè)a,b∈R,記max{a,b}=函數(shù)f(x)=max{|x+1|,|x-2|}(x∈R)的最小值是________.

試題詳情

8.(2009·南昌二調(diào))函數(shù)f(x)=,若f(4x1)+f(4x2)=1,x1>1,x2>1,則f(x1·x2)的最小值為( )

A.                             B.

C.2                            D.

答案:B

解析:依題意得f(x)=1-,

1-+1-=1,

由此解得log2x2=,log2(x2x1)=log2x2+log2x1=+log2x1=+log2x1=-2++(log2x1+1)≥-2+2=2,故f(x1x2)=1-≥1-=,f(x1·x2)的最小值是,故選B.

試題詳情

7.在區(qū)間[1.5,3]上,函數(shù)f(x)=x2+bx+c與函數(shù)g(x)=x+同時(shí)取到相同的最小值,則函數(shù)f(x)在區(qū)間[1.5,3]上的最大值為( )

A.8                            B.6

C.5                            D.4

答案:D

解析:g(x)=x-1++1≥2+1=3,當(dāng)且僅當(dāng)x=2時(shí),g(x)min=3,

f(x)=(x-2)2+3.

∴在區(qū)間[1.5,3]上,f(x)maxf(3)=4.

故選D.

試題詳情


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