问题 单项选择题 B1型题

三苯氧胺属于()

A.抗代谢类药物

B.细胞毒素类药物

C.生物碱类药物

D.激素类药物

E.抗生素类药物

答案

参考答案:D

解析:阿糖胞苷属于抗代谢类药物,其在体内经脱氧胞苷激酶催化成二或三磷酸胞苷,进而抑制DNA多聚酶的活性而影响DNA合成;也可进入DNA中干扰其复制,使细胞死亡。三苯氧胺为合成的抗雌激素药物。结构类似雌激素,能与雌二醇竞争雌激素受体,与雌激素受体形成稳定的复合物,并转运入核内,阻止染色体基因开放,从而使癌细胞的生长和发育受到抑制。

阅读理解

根据短文内容,选择最佳选项.

    Learning a foreign language is difficult for many learners, but the following tips may help you learn a

foreign language quickly.

    Reading aloud

     When you  start  learning  a  foreign language,  read  aloud. It  will  help  you  increase  (增加)  your

vocabulary. Studies have shown that reading aloud instead  of  reading  lowly  only to yourself  helps  in

remembering. It helps with pronunciation, too.

    Building your vocabulary

    You'll have to make a few word lists, have to memorize and review them regularly. You may have to

review the word  lists at  least once a day  for two weeks. Later you may need to  review the word  lists

once a week for the next four to five weeks.

    Learning grammar

    Learning the  grammar of a  foreign  language is a  dry and  boring  task. But it  can speed  (加速)  your

language learning. Don't jump to learn tenses (时态); it's better to be done after you've learned some of

the language. The most important thing is that you shouldn't worry about the mistakes you'll make when

you start speaking the language. It's from these mistakes that you'll learn  the language  better.

    Watching TV and movies

    This is a wonderful way to learn a foreign language quickly. You can watch TV shows in the language

you're learning. They'll help you a great deal with the vocabulary as well as catching what others say and

 also your pronunciation.

1. Reading aloud when learning a foreign language helps in _____.  

A. talking to people

B. understanding words

C. learning grammar quickly 

D. pronouncing words correctly

2. Which of the following is important in building one's vocabulary of a foreign language?  

A. Writing the words again and again.

B. Listening to tapes in the language.

C. Reviewing words from time to time.

D. Reading more articles in the language.

3. When learning the grammar of a foreign language, you should _____. 

A. learn tenses first            

B. try not to make mistakes

C. make at least one word list    

D. learn from the mistakes you make

4. The underlined phrase "a great deal" means "_____".  

A. much      

B. little      

C. a few      

D. never

5. Which is the BEST title for the passage?  

A. Traditional ways of learning English

B. Some advice on learning a foreign language

C. The importance of learning a foreign language

D. How to deal with the difficulties in learning English

单项选择题