某班50名同学分别站在同一公路上相距1000米的M、N两点处，M处有30人，N处有20人，要让两处的同学集合到一起，并且使所有同学走的路程总和最小，那么集合地点应选在（   ）

    A woman was waiting for her plane at an airport.

    She bought a bag of cookies，found a place to 1and took out her book.She started to read and2noticed that a man，sitting beside her，took a cookie from her bag.She just 3not to see this.So she ate the cookies quickly and at the same time watched how the shameless thief was stealing her cookies.She thought to herself，“If I wasn't such a(n)4 person，I would hit him in the eye.”

    When only one cookie was left，she looked with interest and 5what he would do.He smiled，took the 6cookie and broke it in half.She thought，“This guy is so impolite，he didn't even show any thanks”.

    After her flight was called，the woman 7her luggage and headed to the gate.She took her seat in the 8and started to look for her book，which was almost completed.As she reached her luggage，she gasped(喘气)with 9，because there was an unopened bag of cookies.A terrible thought crossed her mind，“If my cookie bag is here，the other one was his and he just tried to 10”. She realized that she was the impolite one，but it was too late to say sorry to him.

每一家都是这样，在屋子里的时候，____；走在街上的时候，____。我为人人，____。我觉得这种____是很____。

葡萄避雨栽培，是在葡萄的生长季节，在葡萄顶上搭架覆盖塑料薄膜，下雨时使水顺膜流下再排出园外。该技术是以防止和减轻葡萄病害发生，提高葡萄品质和生产效益为主要目的的一种栽培技术。据此回答问题。