第3题: [单项选择]有关对二氧化碳灭火系统的特点及使用范围的叙述中，说法不正确的是( )。 A. 它是一种物理的、不发生化学反应的气体灭火系统 B. 二氧化碳适用于扑救活泼金属及其氢化物的火灾 C. 它主要通过稀释氧浓度、窒息燃烧和冷却等物理作用扑灭火灾 D. 二氧化碳本身具有不燃烧、不助燃、不导电、不含水分、灭火后能很快散逸，对保护物不会造成污损等优点 参考答案:B
第4题: [单项选择]{{B}}Questions 11 to 18 are based on the conversation you have just heard.{{/B}} A. He can’t find his new apartment. B. He had a bigger apartment before. C. He finds the new apartment too big for him. D. He’s having a hard time finding an apartment. 参考答案:C 答案解析:[听力原文]
W: How do you find your new apartment
M: Well, it’s quite nice really, although I have a h
第36题: [单项选择]Tourism （ ） which customers are obliged to purchase without having the opportunity to inspect it. A. is an intangible product B. is not a product C. is a tangible product D. is both A and C 参考答案:A 答案解析:
