单项选择题

Mathematics is the instrument used by the physical sciences to __________ phenomena and record conclusion.

A．expel
B．expire
C．exploit
D．explore

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单项选择题

The government's strong action demonstrated its __________ to crush the rebellion.

A．disturbance
B．disposition
C．duration
D．determination

单项选择题

Before herbs were __________ in supermarkets year-round, herb vinegar was made in the fall.

A．obtainable
B．innumerable
C．credible
D．disposable

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