问题 问答题

Alu序列

答案

参考答案:

解析:Alu序列:在大多数哺乳动物高丰度的短散布重复序列家族中都含有Alu序列,Alu族序列成员众多,大约有300 000个。每个长度约300bp,在其第170位附近都有AGCT这样的序列,可以被限制性内切酶Alu I所切割(AG↓CT),故称这些重复序列为Alu序列。无论从Alu族序列的长度还是从其重复频率上看,Alu族序列都更像高度重复序列,然而它们不同于高度重复序列的串联集中分布,而是广泛散布在非重复序列之间。

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I was loading (装载) my truck to go to the market when I hurt my left eye. The pain was like a hot sword(剑) being shoved through my head. I fell down on my hands and knees, and I knew it was bad.

I was taken to the Erlanger Hospital in Chattanooga, and the doctors operated on me several times but couldn’t save my left eye. When they told me the news, I wanted to die.

Even after I got my fake(假的) eye, I couldn’t shake the sadness. To make matters worse, I lost my job as a transportation officer because of my lost eye. But one morning, I woke up and the TV was on, and there was a 16-year-old girl who had been badly burned on her face and legs. Her situation was much worse than mine. She wore a big smile and seemed to look right at me and said, “You can’t ever give up.” At that moment, I thought, “This is just an eye. Get over it.” And I did.

It’s been almost 12 years since my accident, and there’s nothing I can’t do now that I used to do. And although I didn’t get my old job back, I got my license again.

I read a story once. In that story, a man was feeling bad because he had no shoes until he met a man who had no feet. No matter how terrible your problem is, remember there’s always someone somewhere who’s worse off. So cheer up and smile at life!

小题1:Because of the accident, the writer _______.

A.lost both of his hands.

B.lost one of his eyes

C.was paid a lot of money

D.knew he was not a good driver小题2:According to Paragraph 2, when the writer heard the bad news, _______.

A.he decided to refuse the fake eye

B.he accepted the fact immediately

C.he decided to live a happier life

D.he felt extremely sad小题3:What can we learn from the passage?

A.The writer got his old job back

B.The writer can’t see things clearly

C.The writer is not strong-minded

D.The writer has got over the accident小题4:By writing his story, the writer most probably wants to _______.

A.tell us his unusual experience

B.ask people to help the disabled

C.advised us to be positive(积极乐观的) about life

D.tell us that accident can happen anytime