北京鼎均gre作文机经

查字典英语网 2016年03月01日

      Technologiesnotonlyinfluencebutactuallydeterminesocialcustomsandethics.

      Inmostprofessionsandacademicfields, imaginationismoreimportantthanknowledge.

      Argument:

      Thirteenyearsago, researchersstudiedagroupof 25 infantswhoshowedsignsofmilddistresswhenexposedtounfamiliarstimulisuchasanunusualodororataperecordingofanunknownvoice. Theydiscoveredthattheseinfantsweremorelikelythanotherinfantstohavebeenconceivedinearlyautumn, atimewhentheirmothersproductionofmelatonin ― ahormoneknowntoaffectsomebrainfunctions ― wouldnaturallyincreaseinresponsetodecreaseddaylight. Inafollow-upstudyconductedearlierthisyear, morethanhalfofthesechildren ― nowteenagers ― whohadshownsignsofdistressidentifiedthemselvesasshy. Clearly, increasedlevelsofmelatoninbeforebirthcauseshynessduringinfancyandthisshynesscontinuesintolaterlife.