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．Floods often take place after earthquakes.B．Slides often take place after earthquakes.C．Slides do not often take place after earthquakes.D．Disasters often take place after earthquake.
A．Floods often take place after earthquakes.
B．Slides often take place after earthquakes.
C．Slides do not often take place after earthquakes.
D．Disasters often take place after earthquake.
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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