[求助]沸沸 18 21

andylouis

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.

 

 

答案：E

21. Historian: We can learn about the medical history of individuals through chemical analysis of their hair. It is likely, for example, that Isaac Newton’s psychological problems were due to mercury poisoning; traces of mercury水银, were found in his hair. Analysis is now being done on a lock of Beethoven’s hair. Although no convincing argument has shown that Beethoven ever had a venereal disease, some people hypothesize that venereal disease caused his deafness. Since mercury was commonly ingested in Beethoven’s time to treat venereal disease, if researchers find a trace of mercury in his hair, we can conclude that this hypothesis is correct.

 

 

Which one of the following is an assumption on which the historian’s argument depends?

 

 

A.        None of the mercury introduced into the body can be eliminated.

B.        Some people in Beethoven’s time did not ingest mercury.

C.        Mercury is an effective treatment for venereal disease.

D.       Mercury poisoning can cause deafness in people with venereal disease.

E.        Beethoven suffered from psychological problems of the same severity as Newton’s.

 

 

B

里面的关系搞的不是很清

  求教

 在此很感谢 “程雅祺”该牛人给我的帮助！！

[此贴子已经被作者于2007-8-5 0:42:10编辑过]

joyspring

18题是不是没有看清题目呢，问的是最不能加强结论的一项。E答案说 low-power circuitry在 portable electronic devices受欢迎时第一次安装，这与结论modern aircraft navigation systems are being put at risk by the electronic devices that passengers carry on board没有多大关系，与其他四个答案比，这个的确是最不能加强结论的。

不过跟你一样，对21题有疑惑呢。B选项看答案后大概理解了，用去非削弱的方法比较好理解。大意是有些人是不吸收水银的，因为如果所有的人都吸收水银，那么这么common的治疗方法，应该导致很多人都deaf才对，可事实不是这样。

我选的答案是D，觉得这也应该是个前提才对。

请教牛人再给指点。