由硫酸钾与硫酸铵按3:7的比例制成的一种混肥,25千克袋装

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问题:

由硫酸钾与硫酸铵按3:7的比例制成的一种混肥,25千克袋装

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利益群体

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过氧化氢与硫酸酸化的高锰酸钾溶液进行反应生成硫酸钾、硫酸锰、水和氧气。如果过氧化氢中的氧原子是示踪原子(18O),当反应完成后,含有示踪原子的物质是        (   )

A.硫酸钾

B.硫酸锰

C.氧气

D.水

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下列器官移植中,哪个术后排斥反应较轻

A.肾移植
B.肝移植
C.胰腺移植
D.小肠移植
E.胰肾联合移植

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I’m afraid to grow old—we’re all afraid. In fact, the fear of growing old is so great that every aged person is an insult and a threat to the society. They remind us of our own death, that our body won’t always remain smooth and responsive, but will someday betray(背叛) us by aging. The ideal way to age would be to grow slowly invisible, gradually disappearing, without causing worry or discomfort to the young. In some ways that does happen. Sitting in a small park across from a nursing home one day, I noticed that the young mothers and their children gathered on one side, and the old people from the home on the other.

Whenever a youngster would run over to the “wrong” side, chasing a ball or just trying to cover all the available space, the old people would lean forward and smile. But before any communication could be established, the mother would come over, murmuring embarrassed apologies, and take her child back to the “young” side.

Now, it seemed to me that the children didn’t feel any particular fear and the old people didn’t seem to be threatened by the children. The division of space was drawn by the mothers. And the mothers never looked at the old people who lined the other side of the park. These well-dressed young women had a way of sliding their eyes over, around, through the old people; they never looked at them directly. The old people may as well have been invisible; they offended the aesthetic eye of the mothers.

My early experiences were somewhat different; since I grew up in a small town, my children had more of a nineteenth-century flavor. I knew a lot of old people, and considered some of them friends.

小题1:People are afraid of growing old because it is usually associated with ______.

A.insult

B.threat

C.death

D.betrayal小题2:In the author’s opinion, it is a perfect way to ______.

A.grow old slowly and then die unnoticed

B.grow old suddenly and then die

C.shut oneself up from others when growing old

D.remain young all one’s life and then die suddenly小题3:It can be inferred that young mothers would try to keep their children away from the old because ______.

A.they feared their children might hurt the old

B.they didn’t like their children to take up the space belonging to the old

C.they felt it was wrong to play balls near where the old stayed

D.they didn’t want their children to have anything to do with the old小题4:The author believes the division between the old and the young is _____.

A.made by people

B.understandable

C.formed naturally

D.traditional小题5:From the passage, we learn that the author ______.

A.used to have the same experience as the young have today

B.has never been afraid of getting old

C.was quite free to know and befriend old people in his childhood

D.both B and C

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屋面防水工程、有防水要求的卫生间、房间和外墙面的防渗漏的保修期限为( )年。

A.5

B.4

C.3

D.2

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