第18题: [单项选择]Although money is always useful, it isn't all ______. A. what there is to life B. to which there is in life C. there is to life D. that is in life 参考答案:C 答案解析:[解析] 本题考查的是定语从句，all (that) there is to life中的that可省略。
第19题: [单项选择]化学无处不在，下列与化学有关的说法错误的是（）。 A. 侯氏制碱法的过程中应用了物质溶解度的差异 B. 可用蘸浓盐酸的玻璃棒检验输送氨气的管道是否漏气 C. 碘是人体必须的微量元素，所以要多吃富含高碘酸的食物 D. 黑火药由硫磺、硝石、木炭三种物质按一定比例混成的 参考答案:C 答案解析:A项，侯氏制碱法是将CO
第30题: [单项选择]Hardly a week goes by without some advance in technology that would have seemed incredible 50 years ago. A. hard to invent B. hard to understand C. hard to imagine C. hard to believe 参考答案:D 答案解析:[解析] 各项的意思是：hard to invent难以发明；hard to understand难以理解；hard to imagine难以想象；hard to believe难以相信。划线单词in
