6.During the three years of school life, our class ___ to be a good team group.
A. was proved B. is proving C. has been proved D. proved
5.The students are used to taking part in the ___ run every morning in our school.
A. 800 metres length B.800-metres-long
C.800 metre length D. 800-metre-long
4. is important in people’s daily life.
A. Water B. The water
C. Waters D. A kind of water
3.You ___ have told him the bad news, which made things even worse.
A. needn’t B. oughtn’t to C. couldn’t D. wouldn’t
2.-Shall I give you a ride as you live so far away?
-Thank you. .
A. If you like B. Of course you can
C. It couldn’t be better D. It’s up to you
第一节 语法和词汇知识(共20小题;每小题1.5分,满分30分)
1.Hangzhou is ___ most beautiful city, where you can see ___ famous West Lake.
A. a; the B. a; / C. the; a D. /; the
22.(本题满分15分)
围建一个面积为360m2的矩形场地,要求矩形场地的一面利用旧墙(利用旧墙需维修),其它三面围墙要新建,在旧墙的对面的新墙上要留一个宽度为2m的进出口,如图所示,已知旧墙的维修费用为45元/m,新墙的造价为180元/m,设利用的旧墙的长度为x m,围墙的总费用为y元
(Ⅰ)将y表示为x的函数:
(Ⅱ)试确定x,使修建此矩形场地围墙的总费用最小,并求出最小总费用。
21.(本题14分)在锐角三角形中,边a、b是方程x2-2x+2=0的两根,角A、B满足:
2sin(A+B)-=0,求角C的度数,边c的长度及△ABC的面积。
20.(本题满分14分)
求证:
19.(本题满分14分)
已知:函数
(1)求:f(x)的值域及最小正周期;
(2)求:f(x)的单调减区间;
(3)若,求:sin2x的值。
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