We _______ finish it ahead of time, though it was such a tough task. A. could B. would C. were able to D. ought to 答案:C关于气体的下列说法中,正确的是( ) A.由于气体分子运动的无规则性,所以密闭容器的器壁在各个方向的压强可能会不相等 B.气体的温度升高时,所有的气体分子的速率都增大 C.一定质量的气体,体积一定时,气体分子的平均动能越大,气体的压强就越大 D.气体的分子数越多,气体的压强就越大