问题 选择题

一个健康成年人的尿液中不应该含有(  )

A.尿素

B.无机盐

C.大分子蛋白质

D.水

答案

当血液流经肾小球时,除了血细胞和大分子的蛋白质外,血浆中的一部分水、无机盐、葡萄糖和尿素等物质,都可以经过肾小球滤过到肾小囊内,形成原尿;当原尿流经肾小管时,其中对人体有用的物质,包括大部分水、全部葡萄糖和部分无机盐,被肾小管重新吸收,并且进入包绕在肾小管外面的毛细血管中,重新回到血液里;在肾小管重吸收的同时,肾小管上皮细胞将所产生的物质(如氨)分泌到肾小管的官腔中,与原尿中剩下的其他废物,如尿素、一部分水和无机盐等由肾小管流出,形成尿液.因此健康的人的尿液中只含有尿素、水、无机盐等物质.

故选:C

阅读理解

Early one morning the sub­inspector at a station at the other end of the town rang me. An elephant was damaging the town. Would I please come and do something about it?

I did not know what I could do, but I got onto a horse and started out.  I took my gun, maybe too small to kill an elephant, but I thought the noise might scare him. Various local people stopped me on the way and told me about the elephant's doings.

It was not, of course, a wild elephant, but a tame one. It had been chained up but last night it had broken its chain and escaped. Its owner, had set out to run after it, but had taken the wrong direction. He was now twelve hours' journey away, and in the morning the elephant had suddenly appeared in the town. It had already destroyed somebody's bamboo hut (棚屋), killed a cow and turned over fruit­stalls.

I came round the hut and saw a man's dead body sprawling in the mud.  He was an Indian, and he could not have been dead many minutes. The people said that the elephant caught him with its trunk, put its foot on his back and grounded him into the earth. This was the rainy season and he was lying on his stomach in the soft mud, the__peacebreaker standing beside, looking innocent.

As I lifted my gun, I hesitated a few seconds. Then I fired. That was a shot that did for him.

You could see the pain of it knock the last strength from his legs. But in falling he seemed for a moment to rise, his trunk reaching skyward like a tree. He trumpeted, for the first and only time. And then down he came, with a crash that shook the ground.

小题1:Which of the following statements about the author is TRUE?

A.He was an Indian.

B.He knew elephants well.

C.He was not a local villager.

D.He was the owner of the elephant.小题2:The elephant made so much trouble because ________.

A.its owner treated him cruelly

B.it got out of control

C.it hated the village people

D.it was a wild elephant小题3:The underlined words “the peacebreaker” in Paragraph 4 refer to ________.

A.the elephant

B.the dead man

C.the author

D.the sub­inspector小题4:It can be inferred that the author felt ________ when he shot the elephant.

A.excited

B.sad

C.frightened

D.happy

问答题