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
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
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
4.(2010·沈陽模擬) 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
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
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
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
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________.
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.
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)max=f(3)=4.
故選D.
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