问题 选择题

几种短周期元素的原子半径及主要化合价如下表:

元素代号XYZMRQ
原子半径(×10-10 m)1.860.991.431.600.750.74
主要化合价最高正价+1+7+3+2+5——
最低负价——-1————-3-2
下列说法正确的是(    )

A.元素X和Q形成的化合物中不可能含有共价键

B.X、Z、R的最高价氧化物的水化物之间可两两相互反应

C.R3-比Q2-更容易失去电子

D.M(OH)2的碱性比XOH的碱性强

答案

BC

题目分析:根据表格中各元素原子的半径和元素的化合价可以推断出表格中的元素是第2、3周期元素,其中X、Y、Z、M分别是元素Na、Cl、Al、Mg,而R、Q则是元素N、O。因此根据推得元素,利用元素周期表和元素周期律进行分析:A中X和Q可以形成过氧化钠,含有共价键,A错误;B中X、Z、R的最高价氧化物的水化物分别是氢氧化钠、氢氧化铝和硝酸,因此可以两两相互反应,B正确;N非金属性比O弱,所以N3-比O2-更容易失去电子正确;金属性Na强于Mg,所以Mg (OH)2的碱性比NaOH的碱性弱,D错误;故选BC。

阅读理解

三、阅读理解(共20小题;每小题2分,满分40分)

请阅读下列短文,从每题所给的四个选项(A, B, C和D)中,选出最佳选项,并在答题卡上将该选项的标号涂黑。

When I get off the bus, I’m usually greeted by the sounds of news on CNN. My father welcomes me, and I help him with the usual things—changing the channel and some other tasks. My father has a disease that makes him unable to walk. Despite his disability, my father has always been my role model.

In my first year at middle school, my grades slipped greatly. My father told me I could improve. I currently maintain a B plus average, and he confidently supports me in all my academic efforts. He is against violence to the best of his ability. Love is his most important tool,and he makes sure we know that violence is never the answer.

He urges me not to fear,but to believe in what I think is right.“No matter what anyone tells me,”he says,“I believe what I choose. If someone is discriminating against you for who you are, they don’t deserve your time.”My friends are the most caring people I’ve met, because I realize that they don’t judge me, and they like me as I am.

I’ve always found it strange that people pity me because of my father’s condition. He’s not inferior(次于) to anyone. His disease doesn’t hold him back. He’s normal person.

When I see disabled people out in public, I consider them equal to any other individual. No one is superior to anyone for any physical reason. I’ve known that from that day on, thanks to my dad.

“Anything else?”I’ll ask.

“No, that’s fine.”

As I walk to my room, I think my dad who teaches me the most important things I’ll ever need to know. My father is in no way inferior to anyone else. If anything, he’s even better.

小题1:

According to the passage,we learn that the author’s father is_________.

A.kind but sort of strict

B.disabled but optimistic

C.independent but violent

D.full of love but lacks confidence小题2:

It can be learned from Paragraph 3 that the author’s father gives him some advice on

_________.

A.how to make friends

B.how to help the disabled

C.how to learn from failure

D.how to improve his studies小题3:

.When the author sees disabled people in public,he feels_________.

A.embarrassed

B.sorry

C.natural

D.uncomfortable小题4:

What can we learn from the passage?

A.The author is proud of his father.

B.The author is likely to be taken in by his friends.

C.The author encourages his father to do things himself.

D.The author is looked down upon because of him disabled father.

多项选择题