题目

必须采取措施来阻止他参加校篮球队的选拔。______ 答案：【答案】Something must be done to stop/ prevent/ keep him from trying out for the school basketball team.Action must be taken to stop/ prevent/ keep him from trying out for the school basketball team.【解析】必须采取措施Something must be done/ Action must be taken；阻止他做某事stop/ prevent/ keep him from doing sth；参加……的选拔(角逐) try out for；校篮球队the （6分）【选修3-3】下列说法中正确的是（  ）A．只要知道水的摩尔质量和水分子的质量，就可以计算出阿伏伽德罗常数 B．悬浮微粒越大，在某一瞬间撞击它的液体分子数就越多，布朗运动越明显 C．在使两个分子间的距离由很远（）减小到很难再靠近的过程中，分子间作用力先减小后增大；分子势能不断增大 D．温度升高，分子热运动的平均动能一定增大，且所有分子的速率都增大