单项选择题

The main idea of this passage is ______.

A．studies on the cause of cancer
B．controversial view-points in the cause of cancer
C．the relationship between electricity and cancer
D．different ideas about the effect of electricity on caner

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单项选择题

It can be inferred from physical phenomenon that

A．the force of the electromagnetic field is too weak to be harmful
B．the force of the electromagnetic field is weaker than the electric field that the cells generate
C．electromagnetic field may affect health
D．only more powerful radiation can knock electron out of human body

单项选择题

The view-point of the EPA is ______.

A．there is casual link between electricity and cancer
B．electricity really affects cancer
C．controversial
D．low frequency electromagnetic field is a possible cause of cancer