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
第一節(jié) 語(yǔ)法和詞匯知識(shí)(共20小題;每小題1.5分,滿(mǎn)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.(本題滿(mǎn)分15分)
圍建一個(gè)面積為360m2的矩形場(chǎng)地,要求矩形場(chǎng)地的一面利用舊墻(利用舊墻需維修),其它三面圍墻要新建,在舊墻的對(duì)面的新墻上要留一個(gè)寬度為2m的進(jìn)出口,如圖所示,已知舊墻的維修費(fèi)用為45元/m,新墻的造價(jià)為180元/m,設(shè)利用的舊墻的長(zhǎng)度為x m,圍墻的總費(fèi)用為y元
(Ⅰ)將y表示為x的函數(shù):
(Ⅱ)試確定x,使修建此矩形場(chǎng)地圍墻的總費(fèi)用最小,并求出最小總費(fèi)用。
21.(本題14分)在銳角三角形中,邊a、b是方程x2-2x+2=0的兩根,角A、B滿(mǎn)足:
2sin(A+B)-=0,求角C的度數(shù),邊c的長(zhǎng)度及△ABC的面積。
20.(本題滿(mǎn)分14分)
求證:
19.(本題滿(mǎn)分14分)
已知:函數(shù)
(1)求:f(x)的值域及最小正周期;
(2)求:f(x)的單調(diào)減區(qū)間;
(3)若,求:sin2x的值。
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