单项选择题

A．Cancer.
B．Heart disease.
C．Organ transplant.
D．Lung disease.
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单项选择题
A．They are not as dangerous as people think.B．They can be as friendly to humans as dogs.C．They attack human beings by nature.D．They are really tame sea animals.
A．They are not as dangerous as people think.
B．They can be as friendly to humans as dogs.
C．They attack human beings by nature.
D．They are really tame sea animals.
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