a two-hour walk 和 two hour's walk中为什么前者加a后者不需加a?

a two-hour walk 和 two hour's walk中为什么前者加a后者不需加a? 求助有关名词和数词组成的复合结构用作定语的问题.名词和数词组成的复合结构用作定语书上给出的例子有two-hour talk ,a two hour's talk ,a talk of two hours.有一个题是 you will be given____to finish it.A.tw two-hour walk 和two hours' walk- 和 's的用法.如:I'll have a one-month holiday.= I'll have a one month's holiday.再如：a 400-metre race = a 400 metres' race a four-hour-walk和a four-hour walk那个对哇哇The village is far away from here indeed.It's a four-hour-walk question的qu和two的tw发音一样吗 After two -----------﹙hour﹚walk , he wanted to rest It was in the 1990s when I was in my twenties that I lived in a house which was only a _________ from my school.A.two--hour walk B.two---hours' walk C.two hours' walk D.two---hour---walk 英语改错题：② After two hour's walk , I want to stop to have a rest 请问A __ walk has made me completely tired.此处为何只能填2-hour,而不能填two hour's?2-hour walk是“2小时的路程”,但是two hour's walk同样也是“2小时的路程啊”,不懂 After we_______ stopped to have a rest A a two hours walk B a tow hour walk C a two hours walkD a two hour walk忘记有—了 A没有 B有 C前面有一个 D也是前面有一个 It's two hours' drive和It's a two-hour drive选哪个 it's( ) from our home to the zoo?a.two and a half hours'walkb.a half two hours walkc.two hours and a half hour's walkd.two and a half hours walk it's ()walk from my home to school.a.two hours and a half b.two and half hours'c.two and a half hours' d.two hour and a halfs 【连续提问关注】题目不变!23.____have you been collecting stamps?Since Iwas ten years old.A.how many B.how often C.how long D.how soon24.Jim was late again because he watched TV for____last night.A.two half hour B.two and a half hours C.tw 改错：how long do it take?I go to the park on a car.It is about two hour is walk from here. about__drive A two-hour B two hours' 选哪个为什么 1.Hurry!It＇s already dark,but we have a （）walk.Atwo—hour B two—houred 2.The newly—buil...1.Hurry!It＇s already dark,but we have a （）walk.Atwo—hour B two—houred2.The newly—built library is a （）building.A.five—storey B.five A two hour B two hour‘s C two hours's D two hoursThe theme park is about______ride from the museum。you should start out right nowA two hour B two hour‘s C two hours‘ D two hours