单项选择题

Suppose there were a flood or an earthquake and the people could not be reached by trains or trucks. ______ packages of food could be dropped from planes, the people might starve.

A．Until
B．Before
C．Unless
D．If only
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单项选择题
100 yuan for this mirror! I ______ it would cost so much, said the woman in surprise.
A．know
B．hadn't known
C．don't know
D．didn't know
单项选择题
______, the man jumped into the river to save the drowning child.
A．To take a deep breath
B．Breathing deep
C．Taking a deep breath
D．Taking a breath deeply
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