第21题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. Her umbrella is broken too. B. She needs to use her umbrella. C. She will get her umbrella out of the closet. D. She already loaned her umbrella to someone. 参考答案:B 答案解析:[听力原文]
M: It never fails. It’s raining hard outside and I’m stuck without an umbrella.
W: I’d like
第22题: [单项选择]3AD18A、表示() A. NPN型锗材料高频小功率三极管; B. PNP型锗材料低频大功率三极管; C. NPN型硅材料低频小功率三极管; D. NPN型硅材料高频小功率三极管 参考答案:B
第23题: [单项选择]对于公共产品的概念,以下表述正确的是() A. 不因消费者人数增加而导致其他人消费的减少 B. 因消费者人数增加则导致其他人消费的增加 C. 不因公共产品的增加而导致消费者消费的增加 D. 不因公共产品的减少而导致消费者消费的减少 参考答案:C