问题 单项选择题

阿托品

A.为左旋莨菪碱的外消旋体

B.以左旋体供药

C.分子中无手性中心无旋光性

D.分子中有旋光性但因有对称因素为内消旋,无旋光性

E.以右旋体供药用

答案

参考答案:A

解析:硫酸阿托品为莨菪醇、莨菪酸结合成的酯,莨菪醇内消旋不产生旋光性。天然莨菪酸为S(-)—构型,在提取时易发生消旋化,阿托品为外消旋体。

阅读理解

阅读理解。

     Morison and Philip were classmates. They lived in the same town. After they left school, Morison became

the manager (经理) of a flower shop and Philip became a doctor in a hospital.

     Philip made a girlfriend. He bought a red rose for her each day to show his love, The flowers made her

very happy. Sometimes he took the rose to her himself. But when he was busy in the hospital, he asked

Morison to give the rose to her instead of him.

     One afternoon, Philip came into the flower shop and said to Morison."I'll go to another town to work today.

I have no time to give the letter and the flowers to my girlfriend. Please give her the letter and twenty-four

roses."

     In the evening, when Morison was closing the door of the shop, Philip came."Morison, how many roses

did you give my girlfriend this morning?" asked Philip angrily.

     "I gave her thirty," answered Morison.

     "Why did you do that?" asked Philip.

     "I thought you often bought roses for her in my shop. I want to give her six roses as the gifts (赠品). Six is

a good number, you know," said Morison.

     "How foolish you are!" He threw his letter on the table." Read it!"

     Morison picked it up and began to read: 

      Dear Mimi,

     I love you very much. Today is your birthday. Please accept my present-some roses, One rose is a year.

And the roses are your age.

                                                                                                                                    Yours,

                                                                                                                                      Philip

     "She returned them to me,"eried Philip,"you must go and explain it to her."

根据短文内容判断正、误. (注意:市区考生将答题卡相应位置涂黑,正确的涂"A",错误的涂"B",

县(市)考生将答案填写在题前括号内,正确的填"A",错误的填"B")

(     )1 .Philip and Morison had different jobs after school.

(     )2. Mimi never accepted Philip's flowers.

(     )3. Philip couldn't send flowers to Mimi himself on her birthday because he was ill.

(     )4. Mimi was happy to get six more roses from Philip.

(     )5. From the passage we know that Mimi was 24 years old at that time.

填空题