题目

For most of the day construction worker Sidney Smith and his brother – in – law Joseph Chambers had been   21   along the banks of Lake Waco with little   22  . Chambers suggested they go home, but Smith 33 that there were still several hours of daylight 24 and there was one other place they might try a bit longer before 25 . Smith drove his pickup（小货车）a couple of miles along the 26 road to get to the other side of the lake. This road, in the truest sense, was a path wagging in the heavy 27 area. Even with the sun still high in the cloudless sky, the 28 of trees fo下列哪种情况下，汽车是受平衡力的作用A.汽车匀速地绕过市民广场的绿岛B.汽车启动时，速度由慢变快C.汽车以不变的速度在平直的公路上做匀速直线运动D.汽车进站时，速度慢慢减小到停止