问题 单项选择题 A1/A2型题

下列对药物稳定性表述正确的是()

A.硫酸阿托品因溶液的稳定性受温度影响较大,而与溶液的pH值无关

B.零级反应的反应速度与反应物浓度有关

C.药物的降解不受溶剂的影响

D.表面活性剂不能影响药物的稳定性

E.光能激发氧化反应,药物分子受光线活化而产生分解,从而加速药物的分解。此种反应叫光化学降解,其反应速度与系统的温度无关

答案

参考答案:E

解析:硫酸阿托品是酯类药物,常受H+和OH-催化水解,所以酯类药物的水解速度主要由pH值决定。零级反应因为反应物是在过饱和的情况下反应,所以其反应速度与反应物浓度无关。溶剂、表面活性剂是影响药物稳定性的处方因素,影响药物的降解。光能激发氧化反应,药物分子受光线活化而产生分解,光线波长越短,能量越大,因此紫外线更易激发反应,从而加速药物的分解。此种反应叫光化学降解,其反应速度与系统的温度无关。所以答案为E。

阅读理解

阅读理解。

     Mr Gao lives in a town. When he was twenty-five, his son was born. He calls him Gao Ling.

The little boy is clever and his parents love him very much.        

     It's September lst today. A new school year begins. Gao Ling is happy and wears his most

beautiful clothes. He is going to school with his new bag.        

     "Let me take you to school, dear," said Mrs Gao.        

     "Thank you, Mummy,"said the boy," The school is not far from here, I can go there myself."        

     At school a teacher met the little boy and asked," what's your name, my Little friend?"        

     "Gao Ling, sir," answered the boy.        

     "How old are you?"      

     "Six, sir"      

     "What's your father's name?"      

     "Gao Dalin, sir"      

     "How old is he?"      

     "He's six too, sir"    

     "Oh," The teacher said in surprise(惊讶地)." Is he as old as(与…一样大)you? 

     "Yes, sir," said the boy." He became a father only at that time when I was born."      

1. Mr Gao is _____ now.    

A. six

B. twenty-five

C. thirty-one

D. thirty-five

2. Mr and Mrs Gao love their son because _____. 

A. the boy is clever

B. he likes to go to school

C. he can go to school himself

D. he can answer their questions      

3. Gao Ling is in Grade _____ now.           

A. One

B. Two

C. Five

D. Six       

4. Gao Ling went to school _____.        

A. bycar

B. on foot

C. by train

D. by like            

5. Gao Ling thought _____.    

A. his father and he were born on the same day

B. his father was younger than him.

C. his father forget to tell him about his age

D. Gao Dalin became a father six years ago

单项选择题 A1型题