单项选择题

Without the sun's light______the earth's surface, it would be so cold that life could not exist on the earth.

A．warms
B．warmed
C．warming
D．to warm
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单项选择题
Only in recent years ______ begun to realize that wild dogs, kept within bounds, often do more good than harm.
A．people have
B．since people have
C．have people
D．people who have
单项选择题
The news ______ he had landed on the moon spread all over the school campus.
A．which
B．that
C．what
D．as
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