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．It has linen published.B．It has been thrown out as junk.C．It has been deleted front the computer.D．The woman cannot get it any longer.
A．It has linen published.
B．It has been thrown out as junk.
C．It has been deleted front the computer.
D．The woman cannot get it any longer.
填空题
requirement→requirements
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