问题 单项选择题

下列各项关于白血病的叙述,正确的是

A.骨髓和其他造血组织中白细胞大量增生积聚

B.外周血中白细胞大量增生积聚

C.骨髓和其他造血组织中白血病细胞大量增生积聚并浸润其他器官和组织

D.骨髓和其他造血组织中红细胞大量增生

E.外周血中淋巴细胞大量增多并浸润其他组织

答案

参考答案:C

解析:白血病是一类造血干细胞的恶性克隆性疾病,因白血病细胞自我更新增强、增殖失控、分化障碍、凋亡受阻,而停滞在细胞发育的不同阶段。在骨髓和其他造血组织中,白血病细胞大量增生累积,使正常造血受抑制并浸润其他器官和组织。 [考点] 白血病的定义。

阅读理解

阅读理解。

     It seems that every week someone becomes "the first" or "the youngest" or even "the first married couple"

to do something that doesn't seem to be very useful to the rest of us.

     Why do they do it? Don't they have better things to do with their time and money? Human beings have

already climbed the highest mountains, sailed across the oceans and flown around the world. But there's still

a lot of the universe left, and the bottom of the ocean is still a bit of a mystery, you just need a lot of technology

to explore them. So, those who feel the need for adventure can only do things that have been done before.

     In May of this year a British man became the first person to walk alone from Canada to the North Pole.

Personally, if I wanted to visit the Arctic, I'd rather go as a tourist on a cruise ship, with a helicopter trip to

the North Pole included in the price. But OK, this man decided that he wanted to walk. The problem was that

he went in the spring when the ice begins to melt and break up. So he got stuck on a lonely piece of ice and

a plane had to be sent in to rescue him.

     These sorts of rescues are making many Australians angry with these record breakers. People trying to

break sailing or rowing records get into trouble in the seas. So the Australian navy has to send ships to save

them and this costs the government millions of dollars. I suppose we can't just leave them to drown but we

should give the bill to the people who are rescued.

1. According to the author, the so-called record breakers _____.

A. do not benefit other people at all

B. inspire people to continue exploring

C. are boring and should be stopped

D. are usually not wealthy enough

2. We can infer from the second paragraph that _____.

A. there are no high mountains for people to climb

B. nothing is left for people to explore in the universe

C. it's beyond ordinary people to explore the unknown

D. human beings could fly around the world long ago

3. Many Australians are angry because the record breakers _____.

A. often get into trouble

B. never use a cruise ship or a helicopter

C. never pay their own costs

D. satisfy their needs at the cost of others' interest

4. What is the writer's attitude towards the record breakers?

A. Positive.

B. Negative.

C. Uninterested.

D. Neutral (中立的).

单项选择题