单项选择题

Cold air causes the arteries around the heart to constrict.

A．become rigid
B．contract
C．close
D．die
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单项选择题
Certain colors when incorporated into the decor of a room can produce a cozy atmosphere.
A．light
B．roomy
C．cluttered
D．comfortable
单项选择题
Groundwater, a resource that exists everywhere beneath the Earth's surface, is under increasing risk from contamination and overuse.
A．popularization
B．contraction
C．pollution
D．industrialization
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