问题 单项选择题

对单硝酸异山梨醇酯描述错误的是

A.原是硝酸异山梨酯的活性代谢物
B.作用时间达6小时
C.脂溶性大于硝酸异山梨酯
D.无肝脏的首关代谢
E.作用机制为释放NO血管舒张因子

答案

参考答案:C

解析: 本题考查单硝酸异山梨醇酯的理化性质。
硝酸异山梨酯为二硝酸酯,脂溶性大,易透过血脑屏障,有头痛的不良作用。单硝酸异山梨醇酯为异山梨醇的单硝酸酯。原是硝酸异山梨酯在体内的活性代谢产物。作用机制与硝酸异山梨酯相同,但作用时间较长。无肝脏的首过代谢,口服与静脉注射血药浓度几乎相近,持续作用达6小时。

阅读理解

阅读理解。

     Today we talk about proverbs. A proverb is a short, well- known saying that expresses a common truth

or belief. Proverbs are found in most cultures and are often very old.

     In American history, Benjamin Franklin was famous for his proverbs. He lived in the 1700s and was a

leader of the American Revolution against English rule. He was also a scientist, inventor and writer.

     Franklin published a book called Poor Richard's Almanac. He included many proverbs he had heard or

created. Some of them are still used today, like:" Early to bed and early to rise makes a man healthy, wealthy

and wise."

     Here are other examples of proverbs that Americans use. The first ones are about love. Some people say,

" All is fair in love and war." They mean that anything you do in a relationship or in battle is acceptable.

     Another proverb about love is," Absence makes the heart grow fonder." This means you love someone

even more when he or she is far away. But other people say,"out of sight, out of mind."You may not even

think about that person when he or she is not with you. Which of these proverbs do you think is most true?

      Another proverb says " Love is blind." In other words, when you are in love with someone, you may

refuse to see anything bad about that person.

     Some people are only interested in having a relationship with someone who is very good-looking. You

might tell them that "Beauty is only skin deep." Your girlfriend may be lovely to look at, but she may also have

some bad qualities. Or your boyfriend is a wonderful person, but not good-looking. So what a person looks

like is not really important.

     Sadly, we have no more time for this program. So we must say,"All good things must come to an end."

Thanks for listening.

1. Which of the following is a proverb?

A. I love you more than I can say.

B. Mind your own business.

C. When in Beijing, please call me.

D. Rome wasn't built in one day.

2. From the passage, we know the following about Franklin except ____.

A. he was good at creating and collecting proverbs

B. he was a fighter who was strongly against English rule

C. he was a person who lived more than 400 years ago

D. there were many proverbs in his book Poor Richard's Almanac

3. Most proverbs mentioned in this passage are about _____.

A. wealth and health

B. love and relationship

C. beauty and truth

D. work and studies

4. What is this passage likely to be used for?

A. An English TV program.

B. An English radio program.

C. An English speech contest.

D. An English textbook.

单项选择题 B型题