What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.

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问题 What is the main idea of the passage?
The passage suggests that oxygen remained in the atmosphere because ______.

选项 A、it was caused by outgassing
B、it was heavier than hydrogen
C、hydrogen became trapped in limestone
D、rays from the sun created equal amounts of hydrogen and oxygen ______.

答案B

解析

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托福（TOEFL）

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What is the main idea of the passage? The passage suggests that oxygen remained in the atmosphere because ______.

托福（TOEFL）

Lookatthefollowingtheories(Questions4-7)andthelistofpeoplebelow.Matcheachtheorywiththepersonitiscreditedto.

WilliamGilbertandMagnetismA16thand17thcenturiessawtwogreatpioneersofmodernscience:GalileoandGilbert.Theimpac

HowdesertsareformedA.Adesertreferstoabarrensectionofland,mainlyinaridandsemi-aridareas,wherethereisal

SECTION4Questions31-40Questions31-33CompletethefollowingsentencesusingNOMORETHANTHREEWORDSAND/ORNUMBERSfore

CompletethesummaryofInternationalDrivingLicensesbelow.UseNOMORETHANTHREEWORDSforeachanswerInternational

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positivethinking/thought(s)

Completethesentencesbelow.WriteNOMORETHANTHREEWORDSforeachanswer.EffectsofweatheronmoodTheyexpecttofindth

Whenwerethefollowingfeaturesincludedinanautoshow?Writethecorrectletter,A,B,orCnexttoquestions17-20.Alast

AnimationTechnologyHistoryThomasEdison:firstcamera—1889StuartBlackton:firstanimatedfilmtechnique—u

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