单项选择题

（）is often the case with a new idea, much preliminary activity and optimistic discussion produced no concrete proposals．

A．That
B．It
C．This
D．As

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单项选择题
The（）of such I. Q. tests full of questions on American culture was not questioned at that time.

A. significance
B. validity
C. efficiency
D. justification
单项选择题
A good deal of the （） for his achievement in this field must go to his supervisor, Professor Fang.

A. credit
B. reputation
C. respect
D. praise
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