题目

质点做直线运动的位移与时间的关系为（各物理量均采用国际单位），则改质点A. 第1s内的位移是5m               B. 前2s内的平均速度是6m/sC. 任意相邻的1s 内位移差都是1m     D. 任意1s内的速度增量都是2m/s  答案：D解析:略 从方框中选出合适的词组并用其正确形式填空（有两项为多余项）【1】When he was at university, he ________ a strange disease, which made him lose the ability to speak.【2】If it is sunny tomorrow, let’s ________ it and go to the park.【3】Having hidden in the mountain for nearly three weeks, they had to ________ to the police.【4】To the surprise of the people present, the pig was still alive when it was ________.【5】Mr. Trump ________ in January, 2017 and took some measures to improve America’s economy.