单项选择题

It is desirable that students should acquire some knowledge of the writers whose _______ are placed before them for study.

A．materials
B．manufactures
C．products
D．productions
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单项选择题
The failure of the project might be _______ to a lack of funds.
A．contributed
B．attributed
C．distributed
D．dedicated
单项选择题
The rivers and forests of the New World were ________ with fish and game.
A．sufficient
B．enough
C．adequate
D．abundant
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