单项选择题

Even to many scientists, the problems resulted from the conflict between economic gains and environmental protection are simply ______.

A. insoluble
B. infallible
C. inferable
D. ineffable
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单项选择题
Erikson’s nationality is ______.
A. Australian
B. Austrian
C. English
D. American
单项选择题
According to the passage, Kohlberg was ______.
A. a born achiever for all professional work.
B. strong enough to be promoted to full professorship.
C. enrolled as a Ph.D. candiadte because he got his B.A. degree earlier.
D. equipped with born competitivenss to be enrolled as a Ph.D. candidate.
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