单项选择题


A．knowing
B．to know
C．they know
D．known
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单项选择题
A．Bone structure.B．Smell ability.C．Birth mode.D．Recovery ability against disease.
A．Bone structure.
B．Smell ability.
C．Birth mode.
D．Recovery ability against disease.
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.
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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