单项选择题

Very few people could understand his lecture because the subject was very ______.

A．faint
B．obscure
C．gloomy
D．indefinite
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单项选择题
While fashion is thought of usually ______ clothing, it is important to realize that it covers a much wider domain.
A．in relation to
B．in proportion to
C．by means of
D．on behalf of
单项选择题
Professor Smith explained the movement of light ______ that of water.
A．by analogy with
B．by virtue of
C．in line with
D．in terms of
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