单项选择题

Owing to （） competition among the airlines, travel expenses have been reduced considerably.

A．fierce
B．strained
C．eager
D．critical

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单项选择题

John doesn't believe in （） medicine; he has some remedies of his own.

A．standard
B．regular
C．routine
D．conventional

单项选择题

（） much is known about what occurs during sleep, the precise function of sleep and its different stages remains largely in the realm of assumption.

A．Because
B．For
C．Since
D．While

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