Radio waves traveling at the speed of light ______their discoveries to Earth.

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问题 Radio waves traveling at the speed of light ______their discoveries to Earth.

选项 A、have brought
B、are brought
C、bringing
D、is bringing

答案A

解析 The present perfect verb have brought is the only answer that fits the meaning of the sentence.

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托福（TOEFL）

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Radio waves traveling at the speed of light ______their discoveries to Earth.

托福（TOEFL）

Choosethecorrectletter,A,BorC.MuseumofAnthropologyThemuseumisnotopenon______inwinter.

ENDANGEREDSPECIESAlthoughwecannotdoanythingabouttheplantsandanimalsthatarealready【31】________,wecandosomething

CoursesforinternationalstudentsExampleWritinginfirsttermInsecondterm:【L1】__Throughouttheyear:【L2】_

Registrationtime:9:00a.m.-4:00p.m.Monday-Friday【L11】____SaturdayRegistrationposition:MainBuilding,【L12】

(Researchers)havefoundsubtleneurological(differences)betweenthebrainsofmenandwomen(either)inphysicalstructurean

Inthediurnaltypeoftidaloscillation,thealternateriseandfallofsealevel,asinglehighwaterandasinglelowwatero

A、Whenhewasachild.B、Whenhefinishedhisstudies.C、Whenhebeganhisconcerttouring.D、Whenhewasinvitedtoamusicalc

A、ShehasdecidednottogotoFloridaB、Herplansaren’tdefiniteC、HerfriendjustreturnedfromFloridaD、Shepreferstotrav

Accordingtotheprofessor,whyisitoftendifficultforarchaeologiststocomparetheshapesofvesselsfromdifferentlocatio

Naturalflavoringsandfragrancesareoftencostlyandlimitedinsupply.Forexample,thevitalingredientinarosefragrance

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在生态学分支学科中，按组织层次分类，生态学可分为()①个体生态学②种群生态学③群落生态学④生态系统生态学⑤景观生态学⑥全球生态学⑦区域生态学

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