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7.如圖,數(shù)軸上A,B兩點(diǎn)所表示的兩數(shù)的(    )

A.和為正數(shù)     B.和為負(fù)數(shù)     C.積為正數(shù)     D.積為負(fù)數(shù)

試題詳情

6.如圖,已知圓柱體底面圓的半徑為,高為2,AB,CD分別是兩底面的直徑,AD,BC是母線若一只小蟲從A點(diǎn)出發(fā),從側(cè)面爬行到C點(diǎn),則小蟲爬行的最短的路線的長度是

           (結(jié)果保留根式)

試題詳情

5.如圖,身高為1.6cm的某學(xué)生想測量一棵大樹的高度,她沿著樹影BA由B到A走去,當(dāng)走到C點(diǎn)時(shí),她的影子頂端正好與樹的影子頂端重合,測得BC=3.2m,CA=0.8m,則樹的高度為           .

試題詳情

4.如圖,將Rt⊿ABC繞點(diǎn)A逆時(shí)針方向旋轉(zhuǎn)90º,則旋轉(zhuǎn)后B點(diǎn)的坐標(biāo)是        !

 

試題詳情

3.        。蝗酎c(diǎn)在反比例函數(shù)的圖象上,則k=       ;36º的補(bǔ)角為           

試題詳情

2.Sin600=       ;分解因式:7x2-63=            ;人體中約有2.5×1023個(gè)紅細(xì)胞,則2.5×1023中有         個(gè)有效數(shù)字。

試題詳情

1.|-3|=         ;的相反數(shù)為        ;-30=          ;

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30. I was not angry at all _________ he had done.

A. that   B. which   C. what   D. those

Keys:

1-5. BCBDC   6-10. ACDBA   11-15. CDDAC   16-20. CBBAB

21-25. BDAAB    26-30. ACBBA

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29. He must catch the horse. He knew _______ man than he had tried.

A. well   B. better   C. it better   D. best

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28. The working hours will be changes from 8 to 12 _______ 7 to 11.

instead of   B. to   C. from   D. and from

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