答案:Because electromagnetic waves may make electronic devices fail to work. /
Because electromagnetic waves may cause a plane crash.
句意:為什么不能在飛機(jī)上使用手機(jī)?
根據(jù)第五段第2-4行:
Hospitals and airplanes have many electronic devices. When electromagnetic waves try to go through them, they sometimes stop working. A heart monitor could fail to work properly. A plane could crash.
醫(yī)院和飛機(jī)上有很多電子設(shè)備。當(dāng)電磁波試圖穿過它們時(shí),它們有時(shí)會(huì)停止工作。心臟監(jiān)測器可能無法正常工作。飛機(jī)可能會(huì)墜毀。
可知答案為:Because electromagnetic waves may make electronic devices fail to work. /
Because electromagnetic waves may cause a plane crash.