问题 单项选择题

受体拮抗药的特点是,与受体()

A.无亲和力,无内在活性

B.有亲和力,有内在活性

C.无亲和力,有内在活性

D.有亲和力,无内在活性

E.有亲和力,有较弱的内在活性

答案

参考答案:D

解析:本题考查受体的激动药和拮抗药。与受体有亲和力,又有内在活性的药物是受体激动药;与受体有亲和力,有较弱内在活性的药物是受体部分激动药;与受体有亲和力,但无内在活性的药物是受体拮抗药。故本题答案应选D。

完形填空

阅读短文,根据要求完成下面各小题.

Michael went back to Fullerton, his home town .His visit to Fullerton was very special to him.① He was born there, he grew up there.But he hadn't been back there since he finished high school.

He went to places he hadn't been to for many years. He walked through the park and remembered the days he had walked through that same park with his friends.He passed by the field where he and his friends had played baseball every day after school. And he stood in front of the movie theater and thought about all the Saturday afternoons he had spent there,watching his favorite movie heroes and eating popcorn.

他做了已经很久没有做的事情。He had some home-made ice cream at the ice cream shop. He rode on the merry-go-round in the park,and he went fishing at the lake.For a little while,he felt like a kid again.

He saw people he hadn't seen in years.He visited several of his old neighbors.He said hello to the owners of the candy store near his house.And he also went to see Mrs.Riley, his tenth-grade science teacher.

Michael's trip back to Fullerton was a very nostalgic(怀旧的)experience for him.Going back to Fullerton brought back many memories of days gone by.

小题1:根据短文内容简要回答问题.

Michael went to places he hadn't been to for many years. Which places did he go?

                                         

小题2:根据短文内容简要回答问题.

Who did Michael visit?                                      

小题3:将短文中①处划线的句子译成汉语.                                            

小题4:将短文中②处划线汉语句子译成英语.                                          

小题5:请给短文拟一个适当的英文标题.                                              

判断题