阅读理解：阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项．Imagineyouarealeft-handerSuddenlyeverythingintheworldischanged.Thedourlocksareonthewrongside

阅读理解：阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项．

Imagineyouarealeft-handerSuddenlyeverythingintheworldischanged.Thedourlocksareonthewrongsideandturnthewrongway.

Twenty-fivemillionAmericanswakeupeverydayinjustsuchasorrysituation.Thereareoneintenofuswhoareleft-handedandmustfacetheworlddesignedfortheright-handedmajority.

Whyweareleft-orright-handedremainsasecret.Weknowthatnearlytwooutofthreeleftiesaremenandthatleft-handednessrunsinfamilies.Accordingtoonestudyalmosthalfofthechildrenoftwoleft-handedparentswillbeleft-handed.TheScots-IrishfamilyKerrproducedsomanylefthandersthatin1470thefamilybuiltitshousestairwaywithareversetwist(盘旋).

Ontheotherhandheredity(遗传)alonecannotexplainlefties.Atleast84percentofthemarebornoftworight-handedparents.Andin12percentoftwinsonewillberight-handedtheotherleft.

Perhapsthegreatestpuzzleofallisnotwhysomepeopleareleft-handedbutratherwhysofeware.Infactalmostequalnumbersofindividuals(个人)willfavoreithertherightortheleft.Howeverscientistsaretryingtosetthingsrightandtheyarebeginningtostudythemanywaysleft-handersdifferfromright-handersbyconsideringhowtheirbrainswork.

1．HowmanyoftheAmericansareleft-handers?

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A．10%.

B．12%.

C．50%.

D．84%.

2．WhichofthefollowingisNOTtrue?

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A．Alefthandedmanmayhavearight-handedtwinbrother.

B．Thegreaterpartofleft-handershaveright-handedparents.

C．OneintenofAmericansareleft-handed.

D．Mostpeoplewillprefertherighttotheleft.

3．Fromthepassagewecanseethat________.

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A．thereisatleastaleft-handerineveryAmericanfamily

B．left-handersaregenerallyclevererthanright-handers

C．mostpeopleallovertheworldareright-handers

D．left-handersleadanuncomfortablelife

4．InParagraph3theunderlinedword“runs”means________.

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A．goes

B．flows

C．leaves

D．continues

5．Whysofewpeopleareleft-hand