11．Black boxes（黑匣子） are special instruments．They are mainly used on planes to record all in-flight information．They are the most important tools to help people find out the reasons of air accidents．
A plane often carries two black boxes-the Digital Flight Data Recorder which can record data about the speed，direction，while the Cockpit Voice Recorder keeps conversations and other sounds in the pilots'cabin （驾驶舱）．
They are wrapped （包裹） with thick steal and other special materials that can stop high temperature．They often are placed on the tails of planes，which are considered the safest places of planes，so that they can't be destroyed badly when air accidents happen．
They are not black，instead，they are colored orange to make them easy to see．Because the instruments are often burned and turned into black after air accidents，people often call them black boxes．
They can survive （幸存） in as deep as 6，000meters underwater or a very high temperature-one hour at 1，100degrees centigrade．They can send signs for one month so that people can find them．
Not all black boxes work well after air accidents．Luckily，nine out of ten of them can be explained．They have helped people find out the reasons of many air accidents so far．
32．What can a black box do？B
A．Help the pilots drive the plane．
B．Record some information about plane．
C．Avoid air accidents．
D．Keep passengers feel comfortable during flying．
33．Where are black boxes often placed？D
A．In the pilots'cabin．
B．In the front of the plain．
C．On the wings of the plane．
D．At the tail of a plane．
34．Which of the following is Wrong？D
A．There are often two black boxes on a plane．
B．Black boxes are made of special materials．
C．Black boxes can keep sending signs for a month．
D．All black boxes can tell what happened after air accidents．
35．What does the passage mainly tell us？A
A．What are black boxes．
B．How do black boxes work．
C．What are black boxes made of．
D．How can black boxes be found．
分析 本文主要讲述了飞机上记录飞行速度、方向等信息的黑匣子的情况，它可以在发生事故以后帮助找到原因．
解答 32．B 细节题．根据文章内容，They are mainly used on planes to record all in-flight information 黑匣子通常被用在飞机上记录飞行信息，结合选项，故选B
33．D 细节题．根据文章内容，They often are placed on the tails of planes，which are considered the safest places of planes，黑匣子通常被放在被认为是飞机上最安全的机尾，结合选项，故选D
34．D 细节题．根据文章内容，Not all black boxes work well after air accidents．Luckily，nine out of ten of them can be explained不是所有的黑匣子在经历了事故之后都能很好的工作，幸运的是，90%的黑匣子是可以正常运作的，结合选项，故选 D
35．A主旨题．本文主要讲述了飞机上记录飞行速度、方向等信息的黑匣子的情况，它可以在发生事故以后帮助找到原因．结合选项，故选A
点评 本文是一个科教类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
