作者：英吉
Each year companies in the United States could save as much as $58 billion annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided offices with cleaner air.
(A) annually by preventing illness among employees and gain as much as $200 billion through improving performance of workers if they simply provided
(B) annually if they prevented employee illness and gain as much as $200 billion through worker performance improved by simply providing
(C) annually in employee illness prevention and gain as much as $200 billion through worker performance improved by simply providing
(D) in employee illness prevention and gain as much as $200 billion through improving performance of workers if they simply provided
(E) by preventing illness among employees and gain as much as $200 billion through improved worker performance if they simply provided
原文意思：每年美国的公司能通过预防员工生病节省一部分钱并且能通过提高员工战斗力挣一些钱。
题目分析：读完A语义说的通，留着。
B用they，可是prevent和前面的动词发起者没有变化，不用加they，干掉。C读到in employee illness preventing就很别扭，语义没有A通顺，干掉。
D和C犯了相同错误，干掉。
E乍一读也没有明显错误，我们把这个选项和A进行对比，一个用imporving另一个用improved，而performance是被improved的，所以E语义更合适，我上课反复强调，我们上来争取杀四个，如果做不到，留下来的选项如果长的比较像还是可以理解的，就像这道题的A和E一样，没有仔细看得情况下把A留下是可以理解的！
