A
阅读下列短文，根据短文内容填空。在未给提示词的空白处仅填写一个适当的词，在给出提示词的空白处用括号内所给词的正确形式填空。
These pioneers of the 20th century were all dedicated to improving the quality of human life on earth, but sometimes breakthrough discoveries that ___1___ (affect) our lives today happened by mistake! For example, we are all grateful for the handy microware oven that allows us ___2___ ( prepare )meals in minutes and we have Percy Spencer to thank. This inventor, with 120 patents to his name, discovered microwaves when he was experimenting with radars and noticed a chocolate ___3___ (melt) in his pocket.
【答案】1. have affected
2. to prepare
3. melting
【解析】
本文是一篇说明文。有些影响我们今天生活的突破性发现是无意中发现的。文章列举了微波炉的发现过程。
【1题详解】
考查动词时态。此处强调对现在的影响，应使用现在完成时；设空处是定语从句谓语动词，先行词是breakthrough discoveries，属于复数概念，助动词应使用have。故填have affected。
【2题详解】
考查非谓语动词。固定短语：allow sb. to do sth.“允许某人做某事”。故填to prepare。
【3题详解】
考查非谓语动词。固定短语：notice sb. doing sth.“注意到某人正在做某事”，此处指“注意到口袋里的巧克力正在融化”。故填melting。
