公共英语考试

【单选题】Questions 17—20 are based on the following passage. You now have 15 seconds to read questions 17—20. Which of the following is true according to the passageA．Radiation at low levels is harmless.
B．Radiation produces cells in a strange way.
C．Radiation can lead to cancer.
D．Radiation’s damage is obvious.

网考网参考答案：C
网考网解析：
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