问题描述：
[单选]
行人安全过马路要注意（）
A．(1)走人行横道、人行天桥或地道
B．(2)没有设人行横道、人行天桥或地道的
C．( 3)如有红、绿灯管制的人行横道，同样要遵守红灯停，绿灯行的交通规则。
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答案解析：无
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上一篇：Phone signals are relayed between cell towers and cellphones via radio waves． This radio frequency—or RF—radiation is a type known as non-ionizing （非电离的）． Unlike X-rays， non-ionizing radiation does not deposit enough energy into cells to release electrons from atoms or molecules， producing ions． So it tends to be far less harmful than ionizing radiation， such as X-rays． But that does not mean radio waves might not cause harm．What is the paragraph mainly about？
下一篇：在公路上做哪些活动是妨碍交通，也是不安全的。（）
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