第7题: [单项选择]在驻波中,两个相邻波节间各质点的振动( )。 A. 振幅相同,位相相同 B. 振幅相同,位相不同 C. 振幅不同,位相相同 D. 振幅不同,位相不同 参考答案:B
第8题: [单项选择]Passage Two Questions 29 to 31 are based on the passage you have just heard. A. They are useful and practical. B. They are of great importance. C. They are imaginative and personal. D. They are fashioned and quick to arrive. 参考答案:A 答案解析:[听力原文] What does Marie Angelou think of the electronic communicationdevices [解析] 选项均为