单项选择题

Why did the man wake up late this morning

A．Because he twisted his ankle the night before.
B．Because the battery in his alarm clock had run out of electricity.
C．Because his mother forgot to wake him up.
D．Because he didn’t hear the alarm clock.
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单项选择题
People will have sore eyeballs when crossing snow-covered territory because ______.
A．the eyeballs produce more and more liquid
B．they find nothing to focus on
C．vision becomes unclear
D．tears cover the eyeballs
单项选择题
The word maintaining in line 3 of the first paragraph is closest in meaning to ______.
A．reducing
B．preserving
C．avoiding
D．measuring
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