题目

．推理是学习化学的一种重要方法。下列推理合理的是 A.   离子是带电的粒子，带电的粒子一定是离子， B.   单质是由同种元素组成的，则由同种元素组成的纯净物，一定是单质 C.   中和反应有盐和水生成，则有盐和水生成的反应，一定是中和反应 D.   溶液具有均一性和稳定性，则有均一性和稳定性的液体一定是溶液 任务型阅读 阅读短文并根据短文内容完成表格。(每空一词) 　　It's a problem that every year thousands of people get hurt or die when they are crossing the road．Most of these people are old people and children．Old people often get hurt or die because they can't see or hear well．Children often get hurt or die because they are not careful．They forget to look and listen before they cross the road． 　　How can we reduce traffic accidents? First, all of us must obey(遵守) the traffic rules．For the drivers, they shouldn't drive too fast．If they drive too fast, it will be very difficult to stop the cars in a very short time．The drivers mustn't drink wine before they drive out．For the walkers, first, they must be careful when they are walking on the road．When they walk across the road, we must try to walk underpasses or footbridge．If there are no underpasses or footbridge, we must walk the crosswalk．We must stop and look both ways before crossing the road．Look left first, next look right, then look left again．Only when we are sure that the road is clear, we can cross it．The right way to cross the road is to walk quickly．It's not safe to run．If people run across the road, they may fall down．Second, try to help children, old people or blind people to cross the road．Third, never play in the street．