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)
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)
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 .
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 !
3. 。蝗酎c(diǎn)在反比例函數(shù)的圖象上,則k= ;36º的補(bǔ)角為
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。
1.|-3|= ;的相反數(shù)為 ;-30= ;
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
29. He must catch the horse. He knew _______ man than he had tried.
A. well B. better C. it better D. best
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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