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 is not theirs.B．It has some problems.C．It is out of warranty.D．It was stolen.
A．It is not theirs.
B．It has some problems.
C．It is out of warranty.
D．It was stolen.
单项选择题
A．Bone structure.B．Smell ability.C．Birth mode.D．Recover ability against disease.
A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recover ability against disease.
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