单项选择题

______ is the length of the closed curve of a circle.

A．Radius
B．Diameter
C．Dimension
D．Circumference
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单项选择题
Our knowledge about agriculture has so far been ______ confined to books.
A．primarily
B．exclusively
C．repeatedly
D．undoubtedly
单项选择题
All the following sentences are emphatic sentences EXCEPT
A．This is the very question that deserves careful analysis.
B．It is stability that destroys people’s ambition and barricades people’s steps.
C．He will have it that our plan is really practical.
D．It was not until his wife came back that he went to bed.
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