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2017届高考英语一轮总复习单元精选测试系列资料（十三） Ⅰ.语法填空 Scientists have 1 studying the complex nature of light for thousands of years. 2 was only this century， however， that they unlocked the secrets of this mysterious force. Now that light is more fully 3 (understand)，researchers are searching for ways to put this power 4 work. The most significant invention to come out of this research is，no doubt， the laser. 5 the laser was invented only twenty years ago， its applications are continually growing， in number as 6 as in importance. Today one can find laser in hospitals， factories and 7 in the grocery stores. They are the heart of new weapon systems and they might be the key 8 a new energy supply. Eye doctors are 9 important use of new laser technology. If diseased tissue is found， a 10 (power)laser can be used to burn it away . 语篇解读：该文章主要是介绍激光的发明和应用。 1.解析：have been studying一直在研究该结构是现在完成进行时。 答案：been 2.解析：It be...that...是强调句型。 答案：It 3.解析：考查的是过去式。 答案：understood 4. 解析：put this...to work利用这个力量。 | 
