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同等学力英語冲刺练习及详解（二）
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Twostudiesareaddingtothedebateaboutthehealthrisksofeatingfishcontaininghighlevelsofthemetalmercury(水银，汞).Onestudy1thatpeoplewhoeatfishhighinmercurymayincreasetheirrisk2aheartattack.Yetanotherstudyfoundno3betweenmercuryandheartdisease.
Mercuryisanatural4.Somebodiesofwaterhavebecome5withmercury.Highlevelsofthemetalhavebeenfoundinlargefish,6sharkandswordfish.Scientistssaymercurycanbe7topeople.Forexample,itcanharmthedevelopingbrainofafetus(胎儿)orchild.Sosomeexpertssaythatpregnantwomen8fishcontaininghighlevelsofmercury.9,theAmericanHeartAssociationandotherexpertshave10Americanstoeatfishatleasttwotimesaweek.Fish11importantsubstances,andtheyarebelievedto12theriskofheartdisease.
ScientistsinMarylandorganizedoneofthenewstudies.Theyexamined13recordsofmorethanonethousandandfourhundredmenfromIsraelandeightEuropeancountries.They14menwhohadsufferedaheartattackwithhealthymen.Thestudyfoundthat15levelsinthemenwhohadaheartattackwerefifteenpercent16thanthosewithnohistoryofheartdisease.However,astudybytheHarvardSchoolofPublicHealthinCambridge,Massachusetts17thefindings.TheHarvardscientistscomparedtwogroupsofaboutfivehundredAmericanmen.Allthemeninonegroup18aheartattackandtheothermenshowedno19ofheartdisease.TheHarvardscientistsfoundnolinkbetweenmercuryandtheriskofheartdisease.
Manydoctorssaypeopleshouldnotstopeatingfishbecauseof20aboutmercury.
1.A)advisesB)suggestsC)predictsD)objects
2.A)ofhavingB)tohaveC)withhavingD)forhaving
3.A)contradictionB)differenceC)reasonD)link
4.A)constituentB)el
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