GRE

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In the old days,twine held thereed in place in a single．reed instrument．Thistwine was called aliRature.as in the thread used to fie up an artery in surRery．
Mouthpieces were designed withgrooves in place to hold the twine．Instrument Linemaker lwan Mfiller invented ametal ligature for clarinets in the early 1800s，andthis(5)is the sort of liRature that is widely used today．Metal liRatttres held on with screws，similarto those that Mfiller designed．are used on saxophonesas well．Despite the ease of use that a metal ligatureprovides，some clarinet purists prefer to use twine becausethe resulting resonance of the reed is not quite so metallic in tone．
for question ,select one answer choice each. 
A comprehensive summary of the passage couldmost easily omit

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A．
To determine which detail could be omitted，look for the one that does  not support the main idea．Choice A is an interesting detail，but it is not  necessary．

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