【单选题】

The main idea of this passage is______.
A．studies on the cause of cancer

B．controversial viewpoints in the cause of cancer
C．the relationship between electricity and cancer
D．different ideas about the effect of electricity on cancer

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根据网考网移动考试中心的统计，该试题：

2%的考友选择了A选项

9%的考友选择了B选项

29%的考友选择了C选项

60%的考友选择了D选项

The main idea of this passage is______.A．studies on the cause of cancer

The main idea of this passage is______.
A．studies on the cause of cancer