第9题: [单项选择]While doing calculation for the project, the designers ________ a new solution to a geological problem. A. fell into B. stumbled upon C. set out D. discovered 参考答案:B 答案解析:[参考译文] 在对工程进行计算时，设计人员碰巧找到了解决地质问题的方法。
[试题分析] 本题是一道词义辨析题。
[详细解答] “fall into”含义为“被卷入……”；“stumble upon
第19题: [单项选择]The government predicts that food supplies in times of a nuclear war are ______ adequate for a year and a half. A. enough B. poorly C. too much D. more than 参考答案:D 答案解析:高级问题 enough常至于形容词和副词之后，因此这里应写成adequate enough的顺序。too much和不可数名词搭配使用。more than和less than用在形容词和副词的前面，表
