问题详情

Questions 17-20 are based on the following passage. You now have 15 seconds to read ques-tions 17-20.
17. Why does the speaker say that radiation is similar to radio waves？
[A] Because both of them can be detected by human senses.
[B] Because both of them can be sensed by a radio receiver.
[C] Because both of them are harmful.
[D] Because both of them can only be detected by devices.请帮忙给出正确答案和分析，谢谢！