单项选择题

Rats are ______ to sleep during the day.

A．included
B．intended
C．prone
D．afraid
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单项选择题
Everyone must have liked the cake because there wasn't even a ______ left.
A．crutch
B．chum
C．chore
D．crumb
单项选择题
Distances in space seem ______ great when compared with distances on earth.
A．hopelessly
B．excellently
C．inaccessibly
D．incredibly
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