问题 问答题 简答题

试说明耐酸、耐酶、广谱青霉素的结构特点,并举例。

答案

参考答案:

耐酸青霉素的侧链上大都具有吸电子基团,如非奈西林、阿度西林等;耐酶青霉素的侧链上都有较大体积的基团取代,如苯唑西林、甲氧西林等;广谱青霉素的侧链中都具有亲水性的基团(如氨基,羧基或磺酸基等),如阿莫西林、羧苄西林等。

阅读理解

Mum went to Peter’s bed and said, “I want to borrow Tim’s radio for you.” Peter touched the letter in his pocket and said, “Thanks, Mum ! But you are so tired now.” “Today I want to send you a special gift on the radio. It will surprise you. I will come back soon.” Mum said and quickly left in the heavy snow.

Peter took out the letter. He got it in the afternoon. Mum didn’t know about it. Mum wrote in the letter: The 26th of this month is my son Peter’s birthday. Could you please bless(祝福)him on Happy Family? He has been ill for one month. The radio station wrote on the top: I’m sorry to tell you that we have canceled(取消) this program.

Mum came back with a radio. She walked very slowly. There were lots of snow on her clothes. And the program began quickly.

Next Peter got very surprised. “Originally(原来),we planned to cancel this program, but lots of people like it very much. Now, let’s bless the following people together, Kate, Martin, Linda...”The list was long. Mum was too tired and she fell asleep. Peter didn’t hear his name to the end. But he was quite moved(被感动). He woke up Mum, “Mum, I heard my name just now. They said I am a very good boy. I am very happy. Thank you for your nice birthday gift, Mum!” Mum smiled with tears. Peter also smiled with tears. He believed it was the best birthday gift for him.  

根据短文内容判断正(T) 误(F)

小题1:Mum went out to borrow a radio for Peter.

小题2:It was rainy on Peter’s birthday.

小题3:Mum didn’t know that the radio station had planned to cancel the program.

小题4:Mum was too busy to listen to the program.

小题5:Peter was moved because he heard his name on the radio.

问答题 简答题