11. Any combination of overwork and stress inevitably leads of insomnia. Managers at HiCorp, Inc., all suffer from stress. A majority of the managers—despite their doctors’ warnings—work well over 60 hours per week, whereas the other managers work no more than the normal 40 hours per week. HiCorp gives regular bonuses only to employees who work more than 40 hours per week.
Which of the following conclusions is most strongly supported by the statements above?
Managers who received the bonus
(A) Managers at HiCorp work under conditions that are more stressful than the conditions under which managers at most other companies work.
(B) Most of the employee bonuses given by HiCorp are given to managers.
(C) At HiCorp, insomnia is more widespread among managers than among any other group of employees.
(D) No manager at HiCorp who works only 40 hours per week suffers from overwork.（E）
(E) Most of the managers at HiCorp who receive regular bonuses have insomnia.
我用充分,必要条件来做这题:
1) Overwork + stress (充分)=> insomnia
2) fact: Some managers overworked
3) HiCorp gives regular bonuses only to employees who work more than 40 hours per week
overworked.=> get bonus (充分) ???????
对这里only 我不知道自己推的逻辑关系对不对.
所以: E
我有点怀疑我对3)究竟是不是充分条件有点糊涂. 尤其是答案中说的不是所有(只是most) 得到bonus的manager 都得了insomnia (E) Most of the managers at HiCorp who receive regular bonuses have insomnia 哎, 越说越糊涂了.
请帮我看看 E 里面为什么没有用all 而用了most ? | 
