The difficulty is predicting how electromagnetic fields might affect an aircraft s computers. Experts know that portable devices emit radiation which affects those wavelengths which aircraft use for navigation and communication. But, because they have not been able to reproduce these effects in a laboratory, they have no way of knowing whether the interference might be dangerous or not.
The fact that aircraft may be vulnerable(易受损的)to interference raises the risk that terrorists may use radio system in order to damage navigation equipment. As worrying, though, is the passenger who can t hear the instructions to turn off his radio because the music s too loud.
Q: The passage is mainly about .
A) a new regulation for all airlines
B) the defects of electronic devices
C) a possible cause of aircraft crashes
D) effective safety measures for air flight
【题目译文】这篇文章是关于
【答案解析】C。从每段的第一句话可知文章讲述电磁干扰对于飞机安全的影响和飞行事故的可能原因。
Exercise 2
Believe it or not, optical illusion(错觉)can cut highway crashes.
Japan is a case in point. It has reduced automobile crashes on some roads by nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons(人字形)painted on the roads make drivers think that they are driving faster than they really are, and thus drivers slow down.
【攻克大学英语四级:阅读篇Day2主旨题】相关文章:
最新
2016-10-18
2016-10-11
2016-10-11
2016-10-08
2016-09-30
2016-09-30