第4题: [单项选择]Questions 22 to 25 are based on the conversation you have just heard. A. Some people didn’t support him. B. Some people are jealous of him. C. His wife wanted him to give up his business. D. He has no confidence to run his business any more. 参考答案:D 答案解析:[听力原文] Which is NOT among the setbacks Mike meet
第11题: [填空题]The basic principles applied to natural-gas vehicles are quite different from those applied to gasoline-powered vehicles. 参考答案:N 答案解析:[解析] 本题涉及天然气交通工具的工作原理。小标题Natural Gas Vehicle Design下首段第一句指出天然气交通工具和汽油交通工具使用the same basic principles
第24题: [单项选择]根据《化学品分类和危险性公示通则》(GB13690-2009)规定,急性毒性是指()。 A. 单剂量或在6h内多剂量口服或皮肤接触的一种物质,或吸人接触1h之后出现的有害效应 B. 单剂量或在12h内多剂量口服或皮肤接触的一种物质,或吸人接触2h之后出现的有害效应 C. 单剂量或在18h内多剂量口服或皮肤接触的一种物质,或吸入接触3h之后出现的有害效应 D. 单剂量或在24h内多剂量口服或皮肤接触的一种物质,或吸入接触4h之后出现的有害效应 参考答案:D