How many theories does the author mention? How do botanists know that root pressure is not the only force that moves water in p

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问题 How many theories does the author mention?
How do botanists know that root pressure is not the only force that moves water in plants?

选项 A、Some very tall trees have weak root pressure.
B、Root pressures decrease in winter.
C、Plants can live after their roots die.
D、Water in a plant’s roots is not connected to water in its stem.

答案A

解析

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本试题收录于：公共英语五级笔试题库公共英语（PETS）分类

公共英语五级笔试

公共英语（PETS）

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How many theories does the author mention? How do botanists know that root pressure is not the only force that moves water in p

公共英语五级笔试

公共英语（PETS）

TheworksofWaltWhitmanhadalastingeffectonthedevelopmentofmodernAmericanpoetry.

LookingtotheFutureWhenamagazineforhigh-schoolstudentsaskeditsreaderswhatlifewouldbelikeintwentyyears,theys

Themainpurposeofthispassageisto______.Inthepassagetheauthorisprimarilyconcernedwith______.

CollegeeducationThecaseforcollegehasbeenacceptedwithoutquestionformorethanageneration.Allhighschoolgraduates

TheDifferencebetweenManandComputerWhatmakespeopledifferentfromcomputerprograms?Whatisthemissingelementthat

"Lucky"LordLucan—AliveorDeadOn8thNovember1974LordLucan,aBritisharistocrat(贵族)，vanished.Thedaybefore,hischi

"Lucky"LordLucan—AliveorDeadOn8thNovember1974LordLucan,aBritisharistocrat(贵族)，vanished.Thedaybefore,hischi

FindingaJobAtsixteenRonMackiemighthavestayedatschool,butthefuturecalledtohimexcitedly."Getoutoftheclas

RisingTuitionintheUSEveryspring,USuniversityadministratorsgathertodiscussthenextacademicyear’sbudget.Th

Thetiesymbolizesallofthefollowingexcept______.WhydoesBlairsometimesshowupinaformaleventwithoutatie?

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