单项选择题

A．To check the accuracy of scales.
B．To calculate the density of other metals.
C．To observe changes in the atmosphere.
D．To measure amounts of rainfall.
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单项选择题
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
单项选择题
A．He is good at drawing pictures.B．He likes paintings very much.C．He likes visiting the art museum very much.D．He thinks the art museum is a very quiet place.
A．He is good at drawing pictures.
B．He likes paintings very much.
C．He likes visiting the art museum very much.
D．He thinks the art museum is a very quiet place.
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