①小雨在学习上经常帮助同学，共同进步                     ②小海经常和妈妈一起利用周末参加社区的公益活动

③小天过马路时觉得等绿灯浪费时间，喜欢闯红灯     ④小涵总是会关注学校每周更新的时事宣传栏

请选出下列句子中没有语病的一句是 （   ）

根据短文内容，判断下列各句正误。

    Here's the weather report for today. It's going to be dry and windy for most of the day. Because of the wind, it's going to be cooler than usual. And the wind is going to be stronger in the evening.

    Now the report for the weekend. Our Saturday morning is going to be cloudy with little rain. And it's going to be cooler than today. In the afternoon the clouds will lift and the sun will come out. We shall have a warm evening.

    On Sunday the weather is going to change again. It's going to be fine and hot. But at noon a wind will come and it's going to be stronger in the afternoon. It's going to be a little cooler in the afternoon.

甲乙两辆汽车在平直的公路上行使，为了反映两辆车的位置随时间的变化而变化的情况，某人拍摄了一张在同一底片上多次曝光的照片，如图所示．已知每隔2秒曝光一次，两车的运动有什么不同？