18. Modern navigation systems, which are found in most of today’s commercial aircraft, are made with low-power circuitry, which is more susceptible to interference than the vacuum-tube circuitry found in older planes. During landing, navigation systems receive radio signals from the airport to guide the plane to the runway. Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. Clearly, modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board, such as cassette players and laptop computers.
Which one of the following, if true, LEAST strengthens the argument above?
(A) After the laptop computer was turned off, the plane regained course and its navigation instruments and dials returned to normal.
(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.
(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.
(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.
(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.
怎么解释答案是E， 另外B怎么翻译？谢谢各位！！！
(B) When in use all electronic devices emit electromagnetic radiation, which is known to interfere with circuitry.
这句话的意思是——所有的电子设备在使用的状态下都会辐射，而那些辐射会与circuitry相交互。所以也是正确的选项。
(C) No problems with navigational equipment or instrument dials have been reported on flights with no passenger-owned electronic devices on board.
既然在没有电子设备使用的情况下无干扰，那么也与上文观点不矛盾。
(D) Significant electromagnetic radiation from portable electronic devices can travel up to eight meters, and some passenger seats on modern aircraft are located within four meters of the navigation systems.
这句话用详细的数据证明了上文的观点，所以正确。
(E) Planes were first equipped with low-power circuitry at about the same time portable electronic devices became popular.
这句话中引入了“popular”，无关的选项，错误。
Let's Fight,
Demon Hunter
| 欢迎光临 ChaseDream (https://forum.chasedream.com/) | Powered by Discuz! X3.3 |