单项选择题

A．Dropouts are substantially below Ph. D. s in financia……

Research has shown that ______.

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

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单项选择题Before DNA fingerprinting is used, suspects ______.

A．would have to leave their fingerprints for further investigations
B．could easily escape conviction of guilt
C．would have to submit evidence for their innocence
D．could be convicted of guilt as well