The "cloak" scientists have invented

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问题 The "cloak" scientists have invented

Scientists have created the first device to render an object invisible in three dimensions. The "cloak" hid an object from detection using light of wavelengths close to those that are visible to humans. Previous devices have been able to hide objects from light traveling in only one direction; viewed from any other angle, the object would remain visible. This is a very early but significant step towards true invisibility cloaks.

选项 A、can keep an object invisible in three dimensions.
B、can hide an object from detection only in one direction.
C、is a true invisibility cloak.
D、is just a minor achievement.

答案A

解析

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专业英语四级

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The "cloak" scientists have invented

专业英语四级

WhenhisdaughterMarywentoutforhereveningwalkDoctorCochransatforanhouralonemhisoffice.Itbegantogrowdarkan

Manytheoriesconcerningthecausesofjuveniledelinquency(crimescommittedbyyoungpeople)focuseitherontheindividualor

Inlearningaforeignlanguage,______English,oneshouldfirstpayattentiontospeaking,whichisthegroundworkofreadingan

WhathappenedattheUnitedNations?Howdidthecriticslikethenewplay?(1)_____aneventtakesplace,newspapersa

______enougharticles,Mr.Smithwasrefusedpromotioninhisacademictitle.

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Peterpreferstobehisownbossand______hisownbusiness.

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Chancesforaquicksettlementofdisputesarebeginningto_____becauseneithersideiswillingtocompromise.

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