问题
填空题
运动和静止是相对的，这一现象在生活中随处可见．以同样快慢，向同一方向前进的卡车和联合收割机，选 为参照物，它们都是运动的；选 为参照物，卡车是静止的．
答案
地面；联合收割机
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运动和静止是相对的，这一现象在生活中随处可见．以同样快慢，向同一方向前进的卡车和联合收割机，选 为参照物，它们都是运动的；选 为参照物，卡车是静止的．
地面；联合收割机
| 完形填空。 | |||
| The white snow is calling you to the hills,lakes and ponds. 1 sports are cool. Keep some important safety tips(安全小贴士)inyour mind before 2 yourself outdoors. Safetytips forall 3 : Always keep yourself warm.Have some training lessons 4 you are new to a sport. Warm up before all sports. Make sure you are in good physical condition (身体状况). When 5 , wear your helmet. Always ski with a friend. 6 a hill far away from roads and parking lots. There should be no rocks or trees. Make sure your bindings are not too tight. 7 skating, never skate by yourself and don't skate too 8 to other people. Check your skating shoes before you 9 . If you skate on lakes or rivers, make sure the 10 is thick enough. Neverskate near open water. | |||
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