单项选择题

A．Their tasty meat.
B．The principle of their defense system against disease.
C．Their solid skin.
D．The principle of their birth modes.
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单项选择题
A．We are short of paper.B．The printing is not important.C．We should save paper.D．We have to pay for the paper.
A．We are short of paper.
B．The printing is not important.
C．We should save paper.
D．We have to pay for the paper.
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