问题 单项选择题 B型题

正巳烷中毒可测定尿中的()

A.2,5-己二酮

B.2-硫代噻唑烷-4-羧酸

C.苯醌亚胺

D.对氨基酚

E.4-氨基-2,6-二硝基甲苯

答案

参考答案:A

解析:进入体内的三硝基甲苯在肝微粒体和线粒体的参与下通过氧化、还原、结合等途径进行代谢。其代谢问题至今不明确。但接触TNT工人尿内可以检出4-氨基-2,6-二硝基甲苯(4-A)、2-氨基-4,6-二硝基甲苯(2-A)、原形TNT,以及2,4-和2,6-DA(2,4-二氨基硝基苯和2,6-二氨基硝基苯)以及其他代谢物。工人尿内4-A含量最多,也有一定量的原形TNT,因此,尿4-A和原形TNT含量可作为生物监测指标。

阅读理解

阅读理解

       Honesty comes in many forms. First there's self-honesty. Is what people see the real article or do

you appear through smoke and mirrors? I find that if I try to be something I'm not, I feel unsure of myself

and take out a part from my PBA (personal bank account). I love how singer Judy Garland put (表述) it, "Always be a first-class version (版本) of yourself, instead of a second-class version of somebody else."

       Then there's honesty in our actions. Are you honest at school, with your parents, and with your boss? If you've ever been dishonest, I think we all have, try being honest, and notice how whole it makes you

feel. Remember, you can't go wrong and feel right. This story by Jeff is a good example of that:

       In my second year of study, there were three kids in my math class who didn't do well. I was really good at it. I would charge them three dollars for each test that I helped them pass. I'd write on a little piece of paper all the right answers, and hand them off.

       At first I felt like I was making money, kind of a nice job. I wasn't thinking about how it could hurt all of us. After a while I realized I shouldn't do that anymore, because I wasn't really helping them. They weren't learning anything, and it would only get harder down the road. Cheating certainly wasn't helping me.

       It takes courage to be honest when people all around you are getting away with cheating on tests,

lying to their parents, and stealing at work. But, remember, every act of honesty is a deposit (储蓄) into

your PBA and will build strength.

1. The underlined part 'appear through smoke and mirrors' in the first paragraph means______.

A. to be honest              

B. to be unreal    

C. to become clear          

D. to come from an imagined world

2. Which of the following can best explain Judy Garland's words?

A. Be your true self rather than follow others.

B. Don't copy others or you can't be the first class.

C. Make efforts to be the first instead of the second.

D. Don't learn from others unless they're excellent.

3. What does the author expect to show by Jeff's story?

A. Honesty can be of great help.  

B. A bad thing can be turned into a good one.

C. Helping others cheat can do good to them.

D. One should realize the wrong in his bad actions.

4. In the last paragraph the author mainly wants to express _______.

A. one must be brave to be honest    

B. it's difficult to be honest when others are not

C. one should be honest when making a deposit

D. honesty in one's actions can help him in the future

单项选择题