单项选择题
All the references she has obtained for her doctoral dissertation ______ about twenty items.
A．make up for
B．add up to
C．come up with
D．put up with
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单项选择题
The English vocabulary is known for a (an) ______ of words which are comparatively seldom used in ordinary conversations.
A．multitude
B．altitude
C．latitude
D．platitude
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单项选择题
John Locke, the well-known 18th-century English thinker, emphasized experience as the ______ condition for expansion of human knowledge.
A．incompatible
B．incredible
C．indefinite
D．indispensable
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