问题 单项选择题

阅读下面文字,完成第11—15题。  由于太阳内部是不透明的,通常我们只能认识太阳的表面。是否可以通过什么方法来直接认识太阳的内部,这无疑是人们所关心的问题。  大家知道太阳的巨大能量来源于中心的热核聚变,主要过程是氢原子核(质子)在高温、高压下聚变成氦的反应,这个过程的一个重要副产品是“中微子”。根据太阳的能量的输出及其中心温度,可以从理论上推算出太阳中微子的流量。  中微子的一个很特别的性质是其穿透力极强,也就是说,它几乎不与其他物质发生相互作用。因此,______①在太阳中产生了一个中微子,______②它也受到大量物质的包围,______③它不会受到任何阻碍而直接跑出太阳表面。______④,天文学家曾指望通过对太阳中微子的探测来得到太阳内部的信息。  从70年代开始,人们就进行了极其困难的中微子的实验,而观测到的中微子的流量只有理论预言的。这就是著名的“太阳中微子之谜”。这个不一致的根源目前仍不清楚。解决这个问题原则上只有两个途径:或是对核物理和粒子物理理论作修正,或是对太阳模型与恒星演化理论作修正。  由于中微子观测的困难,人们希望通过它来探测太阳内部的想法至今无法实现。 对文中“中微子的一个很特别的性质”理解错误的一项是( )

A.太阳中微子的流量与太阳的能量输出及其中心温度有关

B.中微子的穿透力极强

C.中微子几乎不与其他物质发生相互作用

D.中微子会不受任何阻碍直接跑出太阳表面

答案

参考答案:A

解析: 由第三段可知A项中不是对题意的理解。

阅读理解

American people like to say "Thank you" when others help them or say something kind to them.People of many countries do so, too.It is a very good habit.

You should say "Thank you" when someone passes you the salt on the table, when someone walking ahead of you keeps the door open for you, when someone says you have you have done your work well, or you have bought a nice thing, or your city is very beautiful. "Thank you" is used not only between friends, but also between parents and children, brothers and sisters.

"Excuse me" is another short sentence they use.When you hear someone say  behind you, you know that somebody wants to walk past you without touching you.It's not polite to break others when they are talking. If you want to speak to one of them, say "Excuse me" first, and then begin talking.You should also do so when you begin to cough or make any noise before others.

Let's learn to say "Thank you" and "Excuse me".

小题1:You  should say ‘Thank you’ when____________.

A.you say something kind to others

B.you help others

C.someone helps you

D.you need others to help you小题2:From the passage we know “Thank you”is_________

A.used in the world.

B.used more often than “Excuse me”

C.used only by Americans.

D.used only between friends.小题3:You should say “Excuse me ”if you want to ________.

A.cough

B.make some noise

C.go first

D.all of the above小题4:When you are going to ask someone to tell you the way, you should say “_________ ”first.

A.Thank you

B.That’t very kind of you

C.Excuse me

D.I’m sorry小题5:This  passage mainly tells us the way__________

A.to be happy

B.to be polite

C.to help others

D.to learn from Americans

问答题 简答题