25． He said he would come before sunrise; he didn’t, _________. I will never trust him any longer.
A. either B. though C. still D. then
24． It took a few seconds for her eyes to _________ the darkness.
A. aim at B. throw light upon C. rely on D. adjust to
23． I promise that you _________ have 20 dollars if you clean all the windows.
A. will B. would C. should D. shall
22． -Excuse me, could you tell me the way to Chao Tianmen Square?
-Sorry, I’m a stranger here.
-___________.
A. Thanks, anyway B. It doesn’t matter
C. Never mind D. No problem
第一節(jié)：?jiǎn)雾?xiàng)填空(共15小題；每小題1分，滿分15分)
從A、B、C、D四個(gè)選項(xiàng)中，選出可以填入空白處的最佳選項(xiàng)。
21． At _________ first sight, the twins look exactly _________ same.
A. the; a B. a; the C. /; the D. the; /
20．
(19分) 如圖所示，在傾角
、足夠長(zhǎng)的斜面上分別固定著兩個(gè)相距L = 0.2m的物體A、B，它們的質(zhì)量mA = mB =1kg，與斜面間的動(dòng)摩擦因數(shù)分別為
和
．在t = 0時(shí)刻同時(shí)撤去固定兩物體的外力后，A物體將沿斜面向下運(yùn)動(dòng)，并與B物體發(fā)生連續(xù)碰撞(碰撞時(shí)間極短，忽略不計(jì))，每次碰后兩物體交換速度．g取10m/s2．求：
西南師大附中2008-2009學(xué)年度下期期末考試
19．
(16分) 如圖所示，在傾角為
的光滑斜面上端系著一勁度系數(shù)為k的輕彈簧，彈簧的下端連有一質(zhì)量為m的小球，球被一垂直于斜面的擋板A擋住，此時(shí)彈簧沒(méi)有形變．若手持擋板A以加速度a(a < gsin)沿斜面向下做勻加速運(yùn)動(dòng)，求：
(1) 從擋板開始運(yùn)動(dòng)到球與擋板分離所經(jīng)歷的時(shí)間；
(2) 從擋板開始運(yùn)動(dòng)到小球的速度達(dá)到最大，球所經(jīng)過(guò)的路程．
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