Which motivation is generally the more effective for pilots learning？：（）

Which of the statements is NOT true according to the second paragraph?

A．Crashes of general aviation aircraft are a major source of aviation accidents in the United States.

B．Male pilots, like male vehicle drivers, are more likely to have accidents than female pilots.

C．It is commonly known that aircraft crashes are mostly caused by young and inexperienced pilots.

D．Only mature pilots are studied to determine the gender differences in the reasons for aircraft crash.

Which of the statements is NOT true according to the second paragraph?

A．Crashes of general aviation aircraft are a major source of aviation accidents in the United States.

B．Male pilots, like male vehicle drivers, are more likely to have accidents than female pilots.

C．It is commonly known that aircraft crashes are mostly caused by young and inex- perienced pilots.

D．Only mature pilots are studied to determine the gender differences in the reasons for aircraft crash.

Which of the statements is NOT true according to the second paragraph?

A. Crashes of general aviation aircraft are a maj or source of aviation accidents in the United States．

B. Male pilots，like male vehicle drivers，are more likely to have accidents than female pilots．

C. It is commonly known that aircraft crashes are mostly caused by young and inexperienced pi— lots．

D. Only mature pilots are studied to determine the gender differences in the reasons for aircraft crash．

"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．Some of the other major companies are still training pilots but with no presumption of subsequent employment.