问题 多选题

下列说法正确的是(NA表示阿伏加德罗常数的值)(  )

A.常温常压下,18g NH4+所含的电子数为10NA

B.标准状态下,22.4L氧气所含的氧原子数为2 NA

C.56g金属铁与氯气反应时得到的电子数为2NA

D.1 mol由Na2O2和Na2O组成的混合物,其中的钠离子数为4 NA

答案

A、18g NH4+物质的量为1mol,铵根离子是10电子微粒,所含的电子数为10NA,故A正确;

B、标准状态下,22.4L氧气物质的量为1mol,所含的氧原子数为2 NA,故B正确;

C、56g金属铁物质的量为1mol,完全与氯气反应时,氯气得到的电子数为3NA,故C错误;

D、Na2O2和Na2O中钠离子相同,1 mol由Na2O2和Na2O组成的混合物,其中的钠离子数为2NA,故D错误;

故选AB.

阅读理解

  The trend in everyday conversation is to use grandiose(夸大的)words.“Outstanding” is the

new “good,”  “amazing” is the new “OK, ” and “huge” is the new “big.”

I was in a restaurant in Washington D.C.last weekend and every question I asked was answered with exaggeration.

Me:How is the salmon?

Sever:Fantastic!

Me:Does it come with rice?

Sever:Absolutely!

Would a “good” and a “yes” have been enough? Of course!

My father is an average-sized man.He hasn’t gained weight or height for the past 30 years. Therefore, his size remains the same.However,in the same amount of time,his T-shirt size has gone from small to medium to large to extra large.

The reason for the exaggerated word is clear:we are bored with our lives. We want the next

—next thing now.Immediately!

And we also want others to think that we still care,that we can still be delighted,that we know that everything is just great.Even when deep inside we know it can’t be.Everything can’t be great.

I’m not a scientist,so many methods of proof leave little to be desired,or a lot to be desired,or an immensity(无限).   

Listen to the voices around you.Listen to your own voices.There is nothing on the radio that is good or bad,weather is either beautiful or horrible.

Listen,the next time when someone asks you something and you agree,because when you

could simply say “yes”, instead you will say “absolutely’’ or “without doubt ” or “Oh,yeah,unquestionably ---- absolutely without doubt."

Have people forgotten what it is like to be OK? Simply OK with what they have and who they are? If everything is outstanding,if everything is the most amazing thing ever,is anything ever amazing at all?

小题1:By telling his experience in the restaurant,the author intends to ________.

A.show his interest in exaggerated words

B.prove that exaggerated words are widely used

C.blame the restaurant for using exaggerated words

D.tell us the food in the restaurant is extremely good小题2:What do we know about the author’s father?

A.He has gained height and is now a tall man.

B.He likes following the fashion in clothing.

C.His weight is getting greater and greater.

D.The size of his T-shirt is described in exaggerated words.小题3:.So many people like using exaggerated words because_________.

A.they are not satisfied with being normal

B.they don’t want to be looked down upon by others

C.they want to be different from others

D.they are brave in telling their true feelings小题4:According to the passage,if you approve of something,you’d better say “________”.

A.fantastic

B.perfect

C.OK

D.absolutely

多项选择题