(单选题)14: She pretended not to hear,and keep ( ) walking. A: to B: on C: up D: of ...
(单选题)8: It is a big ( ) for him to do such difficult work. A: courage B: challenge C: opportunity D: chance ...
(单选题)21: He just ( ) every day. A: loses time B: kills time C: takes time D: makes time ...
(单选题)15: She bought a lot of things to ( ) her house. A: decorate B: build C: paint D: mend ...
(单选题)9: -I believe we've met somewhere before. --( ) A: -No,it isn't the same. B: No, it can't be true C: I don't think so D: I'd rather not ...
(单选题)3: She won the game ( )her mother. A: by B: through C: from D: in the name of ...
(单选题)16: 关于势能,正确说法是() A: 重力势能总是正的 B: 弹性势能总是负的 C: 万有引力势能总是负的 D: 势能的正负只是相对于势能零点而言 ...
(单选题)23: 质点沿轨道AB作曲线运动,速率逐渐减小,图中哪一种情况正确地表示了质点在C处的加速度? A: B: C: D: ...
(单选题)17: 在系统不受外力作用的非弹性碰撞过程中() A: 动能和动量都守恒; B: 动能和动量都不守恒; C: 动能不守恒、动量守恒; D: 动能守恒、动量不守恒。 ...
(单选题)11: 将充过电的平行板电容器的极板间距离增大,则() A: 极板上的电荷增加 B: 电容器的电容增大 C: 两极板闪电场强不变 D: 电容器储存的能量不变 ...