Choosethewordsorexpressionsandcompletethepassage(选择最恰当的单词或词语,完成短文。用A、B、C或D表示)
Whichofyourhandsdoyouusemoreoften?Very1ofuscanusebothofourhandsequally(同样地)well.Mostofusareright-handed.Onlyaboutfivepeopleoutofahundredarelefthanded.New-bornbabiescanholdthings2eitheroftheirhands,butinabouttwoyearstheyusually3tousetheirrighthands.Scientistsdonotknowwhythishappens.Theythoughtthatweinherited(遗传)fromouranimalancestors(祖先),butthismaynotbe4.Becausescientistshavefoundthatmonkeysprefertouseoneoftheirhandsmorethantheother,…butitcanbe5hand.Thereareasmanyright-handedmonkeysasthereareleft-handedones.Nexttimeyouvisitthezoo,you'llseethatsomeofthemwillusetheirlefthands.Butmostpeopleusetheirrighthandsbetterandthis6lifedifficultfortheleft-handedpeople.Weliveinaright-handedworld.
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