第20题: [单项选择]Which statement is true about first aid A. It usually makes the services of a doctor unnecessary. B. It is usually done by someone who is not a doctor. C. It is usually done by a doctor. D. It is usually done by the victim himself. 参考答案:B 答案解析:[参考译文]关于急救的描述哪句是对的
[试题分析]本题考查综合归纳能力。
[详细解答]可从文中分析出(或根据自己的经验判断)A、C、D三项肯定不正确,只有B项是对的。
第21题: [单项选择]Although there are many predictions about the future, no one knows for sure ______ the world would be like in 50 years. A. how B. that C. which D. what 参考答案:D 答案解析:本题测试宾语从句的引导词。谓语动词knows后面的宾语从句中缺少一个引导词,根据句意和结构,该引导词应在从句中做like的宾语,表示什么样,故只能用what。