题目

短文综合填空 阅读下面的短文，根据短文内容及首字母提示，在短文空白处填入一个恰当的词，使短文内容完整、通顺。 “How are you?” is a usual question. It’s a friendly way that people in America greet (问候)each other，(1)b___________ “How are you?” is also a very unusual question. It’s a question that often doesn’t have an answer. The person who asks “How are you?” (2)e__________ to hear the answer “Fine”, even if the person’s friend isn’t fine. The reason is that “How are you?” isn’t really a question and 2010年3月28日王家岭煤矿发生透水事故，救援工作迅速展开。4月2日下午，事故矿井下发现有生命迹象，原来是被困人员通过敲击钻杆，使其________，发出“当当”的求救信号，这里包含的物理原理有：固体传声效果比气体_____（填“好”或“差”），声音能够传递______（填“信息”或“能量”）。