单项选择题

Scientists' hypotheses are guesses which are already supported by a certain amount of evidence, derived from actual observation and experiment.

A．theoretical
B．psychological
C．empirical
D．emotional
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单项选择题
The bus driver acted with great presence of mind to ______ disaster.
A．evade
B．avert
C．divert
D．disperse
单项选择题
The new law will only have a ______ effect on the lives of most people.
A．nominal
B．marginal
C．skeptical
D．medieval
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