A. it produced a lot of noise B. there were scattered showers C. people could see it high in the sky D. people could neither see nor hear it 参考答案:A 答案解析:本题测试有关细节内容的理解能力。对文中第二段中的关键词“a sonic boom”(飞机突破音速障碍时,由震波所发出的爆炸声)的理解是解题的关键,但如果听不懂该词的意思,只要抓住该句后半部分中的“th