单选题 "This company will not be training any more pilots in the foreseeable future, since we have 400 trained pilots on our waiting list who are seeking employment. The other five major companies each have roughly the same number of trained pilots on their waiting lists, and since the projected requirement of each company is for not many more than 100 additional pilots, there will be no shortage of personnel despite the current upswing in the aviation industry. "
Which one of the following, if true, casts the most doubt on the accuracy of the above conclusion?

A、 Most of the trained pilots who are on a waiting list for a job are on the waiting lists of all the major companies.
B、 In the long run, pilot training will become necessary to compensate for ordinary attrition.
C、 If no new pilots are trained, there will be an age imbalance in the pilot work force.
D、 The quoted personnel projections take account of the current upswing in the aviation industry.
E、 (E) Some of the other major companies are still training pilots but with no presumption of subsequent employment.

【正确答案】 A

【答案解析】[解析] 本题的结论是不培训飞行员不会出现飞行员短缺的情况，本题结论的前提是待业飞行员处于供过于求的状态。因此要使本题的结论的准确性陷入疑问，就要对结论的前提进行质疑。设想大多数接受过培训且在本公司待业的飞行员也在其他五个大公司的待业名单上，那么就有可能出现待业飞行员的供给小于需求的局面，也就是说，在航空工业内出现飞行人员短缺的局面，因此(A)是正确答案。(B)、(C)、(D)和(E)均是无关选项。