问题 选择题

“健康饮食,健康生活”.下列叙述或作法正确的是(  )

A.有人吃海鲜会出现皮肤奇痒等过敏反应,引起过敏反应的物质在医学上称为抗体

B.体液中的溶菌酶能破坏多种病菌的细胞壁,属于保卫人体的第二道防线

C.带“虫眼”的蔬菜和水果,农药含量少,可放心购买

D.当大腿大血管破裂出血时,要按住破裂血管的近心端止血

答案

A、抗原,是指病原体侵入人体后,刺激淋巴细胞产生一种抵抗该病原体的特殊蛋白质即抗体,引起淋巴细胞产生抗体的病原体就是抗原.抗原包括进入人体的微生物等病原体、异物、异体器官等.过敏反应是人体免疫功能过强形成的,引起过敏反应的物质在医学上称为抗原,而不是抗体.故不符合题意;

B、人体的三道防线是:第一道防线是皮肤、粘膜、和纤毛.功能是阻挡、杀菌和清扫异物;第二道防线是体液中的杀菌物质如溶菌酶和吞噬细胞,功能是溶解、吞噬病原体;第三代防线是免疫器官和淋巴细胞功能是能产生抗体抵抗抗原(侵入人体内的病原体).因此体液中的溶菌酶能破坏多种病菌的细胞壁,属于保卫人体的第二道防线.故符合题意;

C、蔬菜和水果在生长过程中,有可能受到病虫害的威胁,有的人可能提前喷药预防,并经常喷药,因此蔬菜和水果没有虫害,也没有虫眼;有的人可能没有预防,后来发现,有了虫害,为了保证质量,提高产量,可能要喷药灭虫,尤其是在后期喷药,农药残留更多.因此有“虫眼”的蔬菜和水果叶可能有农药的残留,甚至更多.故不符合题意;

D、动脉是指将血液从心脏输送到全身各处去的血管,动脉出血的特点,血液鲜红、血流速度快,呈喷射状;静脉是将血液从全身各处输送回心脏的血管,静脉出血时,血液暗红,血流速度较慢;毛细血管出血,血液像水珠一样慢慢渗出.静脉出血在远心端用手指压或绷带压迫止血;动脉出血在近心端用手指压或绷带压迫止血,毛细血管出血可以自然止血,也可以用干净纱布包扎伤口.因此当大腿大血管破裂出血时,应先判断出血类型,然后对应施救.故不符合题意.

故选B.

阅读理解

阅读理解。

     Two people sit down to play Go (围棋). One of the players is an old man. He is now 89 years old. He

has spent all of his life playing this game. The other person is a young woman. She has been playing Go for

only three years. Before this, the woman was an expert at playing computer games. Now she plays Go the

same way she played computer games-by becoming a machine herself.

     They will play many games, until they know who the winner is. The woman shows no feelings but

thinking about all the possible ways of placing her next stone. The old man, on the other hand, looks at the

movements of her hands and of her face. This has always helped him to win.

     He wins the first three games. She wins the next game, and the man is surprised. He has never lost to a

woman. The old man worries about the way the young woman is playing the game. He can't read her face; he

does not understand her way of playing.

     "The way I think about the game" says the woman, "is that it is steps for getting what I want." Again, the

old man is surprised. For him, the game is a way of life itself, and not a model of life.

     "There is no more beauty any longer. Everything is science and rules. Everything is about winning. Nothing

is about playing" he says. They cannot agree with each other; but it is not necessary.

     "Change is a necessary part of life" thinks the man.

     "Playing is as important as winning" thinks the woman.

     They start to play their final game.

1. According to the passage, the Go games are played by ______.

A. two Go beginners

B. two Go lovers

C. father and daughter

D. husband and wife

2. Before the woman plays Go, she was ______.

A. a computer game player

B. a computer science teacher

C. a computer engineer

D. a computer store owner

3. Which of the following is true according to the passage?

A. The old man loses the third game to the woman.

B. The old man wins all the games against the woman.

C. The woman has her own way of playing Go.

D. The woman is very slow in learning how to play Go.

4. From the passage we can know ______.

A. the old man doesn't care who the winner is

B. the woman pays no attention to the steps

C. the old man learns something from the woman

D. the woman loses the last game to the old man

5. What is the best title of the passage?

A. An Old Go Player

B. A Strange Woman

C. A Boring Game

D. Winning or Playing?

单项选择题