7. (2010·南京模拟) 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·济南模拟)Please read the _______ on the bottle and take the right amount of medicine.
A. explanations B. descriptions C. instructions D. introductions
5.(2010·芜湖模拟)In the of proof, the police could not take action against the man.
A.lack B.shortage C.absence D.failure
4.(2010·沈阳模拟) 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·银川模拟)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·温州模拟) Typhoon Morakot has caused great _________ to the local economies in Wenzhou.
A. injury B. wound C. ruin D. damage
1.(2010·天津模拟)The increase in home computers means that families have much easier to information.
A.measure B.access C.way D.method
9.设a,b∈R,记max{a,b}=函数f(x)=max{|x+1|,|x-2|}(x∈R)的最小值是________.
8.(2009·南昌二调)函数f(x)=,若f(4x1)+f(4x2)=1,x1>1,x2>1,则f(x1·x2)的最小值为( )
A. B.
C.2 D.
答案:B
解析:依题意得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,故选B.
7.在区间[1.5,3]上,函数f(x)=x2+bx+c与函数g(x)=x+同时取到相同的最小值,则函数f(x)在区间[1.5,3]上的最大值为( )
A.8 B.6
C.5 D.4
答案:D
解析:g(x)=x-1++1≥2+1=3,当且仅当x=2时,g(x)min=3,
∴f(x)=(x-2)2+3.
∴在区间[1.5,3]上,f(x)max=f(3)=4.
故选D.
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