题目

He was afraid that the branch might bend over and break, and he would be sent _____ to the ground.    A. crashing    B. throwing    C. rushing    D. dropping 答案:A. crashing. 解析: crash(to the ground)猛跌(到地上)。Crash n. 常指飞机等的“失事”,如:He was killed in an aircraft crash.(他在飞机失事中丧生。)本句中用falling不妥,fall指“落下,掉下”,本身并不强调落下的速度,而crash使“猛跌”,故本题用crashing最佳。在《探究功和速度变化的关系》实验中,下面哪些做法能够减小实验的误差(  )A.各条橡皮筋保证完全一样B.实验时橡皮筋的拉伸不能超过弹性限度C.小车每次可以从不同的位置释放D.橡皮筋的弹力大小必须和橡皮筋伸长量成正比
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