[简答题]Passage One Questions 31 to 35 are based on the following passage. Educators are seriously concerned about the high rate of dropouts (辍学者) among the doctor of philosophy candidates and the consequent loss of talent to a nation in need of Ph. D. s. Some have placed the dropouts loss as high as 50 percent. The extent of the loss was, however, largely a matter of expert guessing. Last week a well-rounded study was published. It was published. It was based on 22,000 questionnaires sent to former graduate students who were enrolled in 24 universities and it seemed to show many past fears to be groundless. The dropouts rate was found to be 31 per cent, and in most cases the dropouts, while not completing the Ph. D. requirement, went on to productive work. They are not only doing well financially, but, according to the report, are not far below the income levels of those who went on to complete their doctorates. Discussing the study last week, Dr. Tucker said the project
A. A．Dropouts are substantially below Ph. D. ‘s in financial attainment.
B．the incentive factor is a minor one in regard to pursuing Ph. D. studies.
C．The Ph. D. candidate is likely to change his field of specialization if he drops out.
D．about one-third of those who start Ph. D. work do not complete the work to earn the degree.