语法填空阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或使用括号中词语的正确形式填空.AnAmericaninventor,DeanKamen,sayshehasinventedtheworldsfi

　　语法填空

　　阅读下面短文,按照句子结构的语法性和上下文连贯的要求,在空格处填入一个适当的词或

　　使用括号中词语的正确形式填空.

　　AnAmericaninventor,DeanKamen,sayshehasinventedtheworldsfirstselfbalancingindividual

　　transportvehicle,__1__iscalledtheSegwayHumanTransporter.TheSegwaylookslikealongstick

　　__2__twowheels.Thestickhashandlesforaperson__3__(hold)．Thewheelsareconnectedbya

　　platform.Thepersonstandsontheplatformandholds__4__handles.Thevehiclemovesforwardor

　　backward__5__thepersonmoveshisbodyinthatdirection.Thedriverturnsthehandles__6__(go)

　　leftorright.TheSegwayhascomputersandgyroscopedevicestomake__7__moveandbalance.Itis

　　poweredbybatteriesthatcanberechargedinafewhoursby__8__(use)anelectricoutlet.Itcantravel

　　ataspeedofnineteenkilometersperhour.Itcostslessthantencentsadaytooperate.Itdoesnot

　　producepollution.MisterKamensaystheSegwaycouldreplacecarsin__9__(crowd)citycenters.He

　　saysitwasdesignedtoreducepollutionandsolveother__10__(environment)problemsincities.

　　However,itwasnotdesignedtotravelonroads.