The passage focuses on . By immersing ore particles in water, .

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问题 The passage focuses on ______.
By immersing ore particles in water, ______.

选项 A、we can get ore particles of equal size
B、we can purify aluminum particles
C、we can filter out aluminum
D、we can improve the working conditions around

答案C

解析本题的依据是最后一句It is hoped that this technique will reduce the amount of high-grade aluminum the United States must import．显然，把矿粒浸入水中的做法目的只有一个，即提取铝。

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本试题收录于： GCT工程硕士（英语）题库专业硕士分类

GCT工程硕士（英语）

专业硕士

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The passage focuses on ______. By immersing ore particles in water, ______.

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专业硕士

Husband:CanIwaitatthecoffeebar?Ifeelillateasewhenyouarepickingthingsout.Wife:______.Idon’twanttoshopal

Effectivepreventionagainstphysicalharmshasneverbeen______urgentlyneeded,especiallyinschools.

Busdriver:Movetotherearofthebus,please.Thereareplentyofseats.Passenger:______?Busdriver:Fortycents.Dropit

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Onafour-daytriptoEthiopia,Ihadadream.Inmydream,Isawtwomen,oneolderandoneyounger,facingoneanotheragainst

SpeakerA:Well,I’mreallygladItalkedtoDougabouttheproblemIwashavingwithmygirlfriend.Hegavemesomeexcellenta

Whatmatters______notwinningbutparticipating.

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