第30题: [多项选择]外因火灾具有()等特点。 A. 火灾发生突然 B. 火灾发生有个过程 C. 持续时间长 D. 火灾来势凶猛 参考答案:A, D
第31题: [单项选择]The Greek alphabet was simpler than the Egyptian system for all the following reasons EXCEPT that ______. A. the former was easy to write B. there were fewer signs in the former C. the former was easy to pronounce D. each sign stood for only one sound 参考答案:C 答案解析:在做此类题时要注意题干的要求。通过阅读文章第四段很清楚就知道选项c“前者容易发音”在文中没有提及,故为正确答案。