问题 选择题

三鹿奶粉因掺有三聚氰胺(化学式为C3H6N6),使全国众多婴儿出现泌尿系统疾病,发生了震惊全国的重大食品安全事故.下列有关叙述错误的是(  )

A.三聚氰胺属于有机物

B.三聚氰胺是一种食品添加剂

C.三聚氰胺分子中原子个数比为C:H:N=1:2:2

D.三聚氰胺中C元素的化合价若为+4价,则N元素的化合价为-3价

答案

A、根据化合物中有无碳元素进行区分,一氧化碳、二氧化碳、碳酸钙等除外,根据化学式可以看出含有碳元素,故A正确,

B、三聚氰胺会使全国众多婴儿出现泌尿系统疾病,故B错误,

C、化合物中原子个数比等于化学式中元素符号的角标的比值,故C正确,

D、碳元素的化合价是+4价,设氮元素的化合价是x,所以 (+4)×3+(+1)×6+6x=0,则 x=-3

故选B.

阅读理解

I was now in my twenty third year of residence in this island and was accustomed to the place and to the manner of living. If it had not been the savages(野人)who had come to the place to disturb me, I could have been content to spent the rest of my time there, even to the last moment, till I had laid me down and died, like the old goat in the cave.

I had also arrived to some little recreations and amusements, which made the time pass more pleasantly with me a great deal than it did before.

At first, I had taught my Poll to speak. And he did it so familiarly and talked so clearly and plain that it was very pleasant to me. And he lived with me no less than twenty six years. How long he might live afterwards, I don’t know; though I know they have an idea in Brazil that they live a hundred years. Perhaps poor Poll may be alive there still, calling Poor Robin Crusoe to this day. I wish no other English man had the bad luck to go there and hear him. But if he did, he would certainly believe it was the devil(魔鬼).

My dog was a very pleasant and loving companion to me, for no less than sixteen years of my time, and then died of mere old age.

As for my cats, they multiplied to that degree that I had to shoot several of them at first to keep them from eating up all I had.

Besides these, I had two more parrots which talked pretty well and would all call Robin Crusoe, but none like my first. Nor indeed did I take the pains with any of them that I had done with him.

I had also several sea-fowls, whose names I don’t know, that I caught upon the shore and cut their wings. And the little stakes which I had planted before my castle wall being now grown up to a good thick bush, these fowls all lived among these low trees and bred there, which was very agreeable to me; so that as I said above, I began to be well content with the life I led if not worried about the threat from the savages.

小题1:What does the passage mainly talk about?

A.Robin Crusoe treated animals kindly.

B.Robin Crusoe led a hard life on the island.

C.The animals raised by Robin Crusoe brought him much pleasure.

D.The savages always spoiled Robin Crusoe’s happy life.小题2:How many parrots did Robin Crusoe mention in this passage?

A.2

B.3

C.4

D.5小题3:According to the passage, which of the following statements is true?

A.Robin’s dog may be still alive on the island.

B.Robin Crusoe lived in harmony with savages.

C.Robin Crusoe met an English man while on the island.

D.Parrots raised by Robin could talk very well.小题4:What is the “sea-fowl” mentioned in the last paragraph?

A.A bird living on the coast.

B.A fish living in the sea.

C.A creature without a name

D.An animal feeding on tree leaves.

单项选择题