The availability of carbon dioxide is an essential(i)______for plant life, while

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问题 The availability of carbon dioxide is an essential(i)______for plant life, while oxygen is equally(ii)______for animal life.

选项

答案 C,F

解析 The best answer is C and F. If something is "essential," it is unlikely to be either a choice or a luxury. Therefore, "condition" is the best answer for Blank(i). Blank(ii)must echo this idea, because of the adverb "equally." Consequently, "necessary" is the best choice for Blank(ii).

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The availability of carbon dioxide is an essential(i)______for plant life, while

Inthelastfewdecades,grassywetlands,essentialtothenestingandbreeding

Thelargeamountsofcarbondioxidenowbeingreleasedintotheatmospherebyth

yearsinthe1940’s,cameasclosetobeingacarboncopyofthejazzvirtuosoi

Becausenaturalgasiscomposedmostlyofmethane,asimplehydrocarbon,vehicle

Carbon-14datingrevealsthatthemegalithicmonumentsinBrittanyarenearly2,

Mostgeologistsbelieveoilresultsfromchemicaltransformationsofhydrocarbon

Scientist:Agreenhousegas,forexample,carbondioxide,formsatransparentla

Carbon-14datingrevealsthatthemegalithicmonumentsinBrittanyarenearly2,

A、carbondioxidetendstoalleviateenvironmentalhaze,whilesulfurousgasesus

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Riceislow-fatandhighinenergy,andyoucanmixitwithjustaboutanyth

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