Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act

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问题 Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act more effectively in cognitive areas such as attention and memory.

选项

答案研究学者已经证实，当人们用脑时，大脑中会发生生化反应，使其在注意力和记忆力这样的认知领域运作效率更高。

解析句子主干：Researchers have established that…；第一个that引导宾语从句，其中when引导时间状语从句；第二个that引导定语从句修饰changes，it指代brain。

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考研英语一

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Researchers have established that when people are mentally engaged, biochemical changes occur in the brain that allow it to act

考研英语一

Whilecrimeisuparoundthenationandspreadoutacrosscitiesinabroadpattern,themajorityofpeopleconvictedofcrimes

InBritainonethirdofallmarriagesendindivorceandoneinfourfamilieswithchildrenisheadedbyaloneparent.Arecent

Lessthanayearago,anewgenerationofdietpillsseemedtoofferthelong-soughtanswertoourchronicweightproblems.Hund

Itispredictedthattherewillbefourscientificbreakthroughsinthe21stcentury.We’llknowwherewecamefrom.Whydoe

[A]Whyreadingfallsintodecline?[B]Readingisrelatedtonationalpolitics[C]Readingisastimulatingexperience[D]Reading

Gettinglaidoffaffectsnotonlyone’seconomicwell-being,italsocurtailsone’sinvolvementincommunityandsocialactiviti

Manywilldoubttobaccoindustryclaimsthatitissharpeningitssciencetoevaluate"healthiercigarettes".Butthat’swhatwi

BankruptcyratesintheU.S.havebeengrowingformorethantwodecadesdespitegenerallyrisinglevelsofpersonalincome.The

Theoperationknownasahemispherectomy—theremovalofhalfthebrain-soundstooradicaltoeverconsider,muchlessperform.I

Organizationsandsocietiesrelyonfinesandrewardstoharnesspeople’sself-interestintheserviceofthecommongood.Thet

Aspreviously______(state),theseunansweredquestionssuggestareasthatareinneedoffurtherstudy.

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图示为起吊一根预制钢筋混凝土梁的情况。当梁匀速上升时，它处于平衡状态。已知梁重W=10kN，α=45。，则钢索AC和BC所受的拉力为()。

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已知点P(1，0，－1)与点Q(3，1，2)，在平面x－2y+z=12上求一点M，使得|PM|+|MQ|最小．

In1971ateamofexpertspreparedareportentitled"TheLimitsofGrowth,"based(1)_____acomputeranalysisoffutureeconom

タバコは 身体——————悪いですよ。

　タバコは　身体——————悪いですよ。