第20题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard{{/B}} A. At a supermarket. B. At a bar. C. At a library. D. At a dormitory. 参考答案:C 答案解析:[听力原文]
M: I’d like to take those three out and return these two.
W: Okay, but they’re overdue. I’l
第21题: [单项选择]关于直流电与交流电,()说法是正确的。 A. 直流电不可以转化为交流电 B. 交流电可以转化为直流电 C. 直流电一般用于低压 D. 交流电一般用于高压 参考答案:B