题目

阅读理解 Next time you're in a public place, take alook around you, and count how many people are using their phones. I can tellyou now that it is probably more than half, whether you're on public transport,in a cafe or simply walking down the street. I'm not saying that I am not an example ofthis, but it always amazes me how people can spend so much time on their phoneswithout actually talking to anyone in particular. For example, I recently visited London andtravelled on the tube while I was there. Apart from the people asleep, almosteverybody else was on their phones, and because of the吹笛子发声主要是A.笛子本身（笛管）振动发声B.笛子中空部分的空气柱振动发声C.吹笛子的演员本身发出的声音D.以上说法都不对