单项选择题

Fresh air and exercise（）good health.

A．contribute to
B．result from
C．attribute to
D．draw on

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单项选择题
It's the boy's laziness that （） his failure in the exams.

A．resulted from
B．resulted in
C．led into
D．brought in
单项选择题
The stars visible at night are immensely distant,（）is why they appear only very small points of light.

A．it
B．which
C．that
D．this
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