半小时用英语讲为什么是half an hour而不是a half hour一个半小时用英语将为什么是one and a half hour 而不是one and half an hour?

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• 1.The scientists from___USA live in___Ninth StreetA./,the B.the,/我选的A答案是B,不是序数词前用the吗?2.The market isn't far from here.It's only___ bicycle ride.A.half an hours' B.half an hour's我选的A答案是B,为什么?3.The boy always stays there for___.A.one and half hour B.one and a half hour C.one and half hoursD.one and a half hours 为什么选D?4.Twelve___were hurt,but no ___were lost in that accident.A.person,life B.people,lives C.peoples,lives D.persons,lifepeople不是不可数吗?5.These
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• 1,It takes us half an hour to read English every morning.(划线部分提问:half an hour)
• 英语I spent half an hour getting to the shop.改为同义句：( )( )( )half an hour( )( )to the shop.