题干

下面文句排序最恰当的一项是(   )

①过去80年,物理学家一直未找到马约拉纳费米子存在的证据。

②基本粒子分为费米子和玻色子,都有反粒子。

③但自然界中可能存在一种反粒子就是自身的马约拉纳费米子。

④中国科学家率先观测到了在拓扑超导体涡旋中存在马约拉纳费米子的重要证据。

⑤费米子和它的反粒子“脾气”完全相反,无法同时出现。

⑥这个发现或将使人类进入拓扑量子计算的时代。

A:②③⑤④①⑥

B:①④⑥②⑤③

C:④①②③⑤⑥

D:②⑤③①④⑥

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D

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(D)

    Every boy wants to find treasure.And Tom was no different.  One summer day Tom told Huck about his idea.

    "Where can we look for treasure?"asked Huck.

    "It's hidden on islands,under dead trees,but mostly under the floors in haunted(闹鬼的) houses."

    So,one Saturday afternoon Tom and his friend went to look for treasure as the haunted house on Cardiff Hill.It was a quiet and lonely which made the boys feel very frightened.They entered quietly,and explored downstairs.Everything was old,broken and dirty.They threw their tools in a corner and walked upstairs,but there was nothing there.They were just about to go downstairs and start digging when Tom stopped.

    "What is it?"whispered Huck,going white with fright.

    "Keep quiet! There's someone downstairs."

    The boys lay down,looking through the holes in the wooden floor.There were two men downstairs.One was an old Spaniard in a wide sombrero hat and the other was duty and unpleasant﹣looking.

    Tom and Hack shook with fear when they heard the Spaniard speak because they found it was Injun Joe He said,

    "It's time for us to move,partner.What will we do with the 650formtherobbery(抢劫)?""Let'skeep30each and leave the bag here."

    The dirty man went to the fireplace and moved a stone.Then he lifted out a bag full of money and look out some coins.The two boys forgot all their fears when they saw there was real treasure downstairs.

    Then Indian Joe started digging a hole with his knife and the knife hit something.

    "What is it?"asked the other man.

    "It's a box,"said Indian Joe.And he put in his hand and pulled out a handful of gold coins.The other man found the boys'tools,and they soon pulled out the box.

    "Where's thousands of dollars in there,"Said Indian Joe.

    "The Murrell Gang used this area one summer,"said his partner.

    "They most have hidden their money here."

    "What will we do with this,Joe?Will we bury(埋)it again?"

    "No,someone might find it,"said Indian Joe."Let's bury it in the member two den(巢穴)."

    Tom and Huck got up as soon as the two men left.They decided to watch out for the"man in the sombrero"when he came to town and find out where the member two den was.