问题
计算题
声音在15℃的空气中的传播速度是340m/s，夏夜，一个耀眼的闪电过后8s才传来雷声，雷声持续了2s才停止，放电的云离你有多远？
答案
2720m
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声音在15℃的空气中的传播速度是340m/s，夏夜，一个耀眼的闪电过后8s才传来雷声，雷声持续了2s才停止，放电的云离你有多远？
2720m
| 完形填空。 | |||
| My brother doesn't like doing exercise. Last night he __1__ again and again. Today my father took him to see a __2__ . The doctor said that my brother had a bad __3__ . He told my father to buy some __4__ and told my brother to have a good rest. __5__ happened to my brother? My brother said he kept the windows __6__ all night. But my father thought that my brother __7__ do more exercise every day. After taking __8__ medicine, he was much __9__ . My mother told us to take good care of ourselves. I will __10__ what my parents said. I will do more sports in the future. | |||
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