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

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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

单项选择题

（） the help of their group, we would not have succeeded in the investigation.

A．Besides
B．Regardless of
C．But for
D．Despite

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