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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

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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

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4.      is important in people’s daily life.

A. Water                  B. The water

C. Waters                 D. A kind of water

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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

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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

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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

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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。

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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。

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20.(本题满分14分)

求证:

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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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