16. Investigators concluded that human failure was not responsible for the fatal airplane crash last August, and since that time new and more stringent rules for identifying and reporting mechanical problems have been in effect. That accounts for the fact that reports of airplane mechanical problems have increased in frequency by 50 percent since last August. Which one of the following is an assumption underlying the argument in the passage? (A) Airplane travel is still relatively safe, despite the increase in reported mechanical problems. (B) Mechanical problems in airplanes have increased dramatically since last August. (C) Mechanical problems in airplanes have not increased by 50 percent since last August. (D) Airlines are less reluctant to report mechanical problems than they previously were. (E) Mechanical problems in airplanes have become easier to detect since last August. WHY C?
对C取非，则reports of airplane mechanical problems have increased in frequency by 50 percent since last August也是正常的了，那么“new and more stringent rules for identifying and reporting mechanical problems”是否起作用了就不确定了。
如果mechanical problems真的上升了50％，那么当report上升50％时，所说的new and more stringent rules for identifying and reporting mechanical problems have been in effect就没有起到作用了。
京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
发表于 2005-3-9 12:37:00
