单项选择题

He usually writes the most important ______ of his lecture on the white board.

A．spot
B．sense
C．point D, element
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The oil must be used up, __ the light went out.
A．since
B．as
C．because
D．for
单项选择题
Professor James used student volunteers as ______ for his experiment.
A．models
B．cases
C．agents
D．subjects
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