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# Modern navigation systems, which are found in most of today

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Senior Manager
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30 Sep 2006, 00:55
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Modern navigation systems, which are found in most of todayâ€™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.
The two portions in boldface play which of the following roles?

(A) The first is a principle that the argument relies on and the second is a conclusion that can be drawn from the first.
(B) The first is a fact that argument relies on and the second is a conclusion that must be drawn from this argument.
(C) The first acknowledges a consideration that supports that main position; the second is that conclusion.
(D) The first is an evidence that supports the conclusion, the second is that conclusion.
(E) The first is a principle that is necessary for this argument, the second is a conclusion that could be drawn from this argument
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Director
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30 Sep 2006, 04:13
Think it is B)
First part is a fact
Second is a conclusion

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Director
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30 Sep 2006, 09:59
B it is ... first is fact (since --- Recently, one plane with low-power circuitry veered off course during landing, its dials dimming, when a passenger turned on a laptop computer. is evidence) and second is conclusion.

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Senior Manager
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30 Sep 2006, 10:05
B i think is out. You should always avoid extreme words, must here is too extreme IMO, the author might draw that conclusion, it doesn't mean I must.

Between D & E for me, going for E, on the fact that the radio steering is more of a principle than evidence.

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VP
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30 Sep 2006, 20:16
I for A out of A and E. B, C and D are out for me.

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VP
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30 Sep 2006, 21:11
My bet is on B.

Sangarelli, great source. Keep posting
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Manager
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01 Oct 2006, 08:35
I am going for E, " that must be " sounds too extreme

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Director
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02 Oct 2006, 03:43
IMO it's B.

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Senior Manager
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02 Oct 2006, 10:25
OA=B
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02 Oct 2006, 14:14
Good one Sangarelli

E was my choice

IMHO B looks a bit extreme with the wording 'Must Be'
I guess it was the difference in meaning of principle and fact that made the difference here.

I bet this is from Kaplan.

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02 Oct 2006, 14:14
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# Modern navigation systems, which are found in most of today

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