题目

对于气体，下列说法中正确的是A．气体的压强是由气体分子的重力产生的B．气体的压强是大量气体分子频繁地碰撞器壁而产生的C．质量一定的气体，温度不变时，压强越大，分子间的平均距离越大D．质量一定的气体，压强不变时，温度越高，单位体积内分子个数越少 答案：BD任务性阅读 　　Some people ___1___ I am the king of the animals. I have a very long neck. Am I a giraffe? No, I ___2___ over 100 tons. Am I a whale? No, I live on land. I am as tall as a five-story ___3___. When I walk, the land ___4___. Am I dangerous? No, don't be afraid. I am not a lion. I don't eat meat. I only eat plants. I don't want to hurt you. But I might step on you by mistake. I can't see you very ___5___. 用方框内所给词的适当形式填空，使文章通顺、连贯、合理。 1．________2．________3．________4．________5．________