2. 考研
  3. The main idea of this passage is______. It can be inferred from physical phenomenon ______.

The main idea of this passage is______. It can be inferred from physical phenomenon ______.

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问题 The main idea of this passage is______.
It can be inferred from physical phenomenon ______.
选项 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
答案A
解析 推理题。文章在第四段二、三句提出"科学家不考虑那种力的有害作用，主要是因为它们太弱"，以及"由电视终端产生的极低频磁场只测出几个毫高斯或者说是地球自己磁场强度的百分之一"。可见这两句都是解释磁场力太弱不会有害。答案为A。
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考研英语一

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