单项选择题

A．so
B．as
C．than
D．like
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What determines whether an animal is sleeping or just resting______.
单项选择题
A．Because it is a personal and economic problem as well as a social one.B．Because it is a totally personal problem.C．Because it is a huge burden on economics.D．Because it is social problem.
A．Because it is a personal and economic problem as well as a social one.
B．Because it is a totally personal problem.
C．Because it is a huge burden on economics.
D．Because it is social problem.
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