单项选择题

"Subtle visual traps" are ______.

A．place where the police hide in order to trap motorists
B．parts of the road which are deceptive to the driver's eyes
C．danger spots such as sharp corners and cross-roads
D．places where there are too many road-signs

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热门试题

单项选择题

The author is mainly ______.

A．talking about the practical problems concerning obtaining good quality audio -recordings
B．talking about the theoretical problems concerning obtaining good quality audio- recordings
C．talking about the observer's paradox
D．talking about the speaker's styles and conscious control