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
Laurels are valued for their aromatic oils and spices, edible fruits, and timber.
A．blossoms
B．leaves
C．wood
D．sap
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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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