[单项选择]{{B}}Questions 29 to 31 are bused on the passage you have just heard.{{/B}} A. They don’t have their own cars to drive to work. B. Many of them are romantic by temperament. C. Most of them enjoy the drinks on the boat. D. They mod to be more friendly to each other.
参考答案:D 答案解析:[听力原文]
What does the speaker say about ferry commuters
第6题: [单项选择]X线在真空中传播时,X线量的衰减与传播距离的关系是() A. 与距离成正比 B. 与距离的平方成反比 C. 与距离的平方成正比 D. 与距离的三次方成反比 E. 与距离的三次方成正比 参考答案:B 答案解析:X线在真空中传播时,X线量的衰减与传播距离的关系是X线量与距离平方成反比。
第7题: [单项选择]制动时的初速度对制动的影响() A. 不显著 B. 尤为显著 C. 显著 D. 不大 参考答案:C