单项选择题

A．Kidney.
B．Heart.
C．Lung.
D．Bone.
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单项选择题
A．Taking the key from the guard secretly.B．Killing the guard to take the key.C．Waking the guard up to ask for his help.D．Stealing the gun from the guard.
A．Taking the key from the guard secretly.
B．Killing the guard to take the key.
C．Waking the guard up to ask for his help.
D．Stealing the gun from the guard.
单项选择题
A．Pollution of the environment.B．A new generation of pest killers.C．Over-killing by hunters.D．Destruction of their natural homes.
A．Pollution of the environment.
B．A new generation of pest killers.
C．Over-killing by hunters.
D．Destruction of their natural homes.
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