问题 单项选择题

下列属于β-肾上腺素受体拮抗剂的药物是

A.麻黄碱

B.哌唑嗪

C.甲氧明

D.普萘洛尔

E.异丙肾上腺素

答案

参考答案:D

解析:
异丙肾上腺素、麻黄碱、甲氧明是肾上腺素受体激动剂,哌唑嗪是α1-肾上腺素受体拮抗剂,普萘洛尔是β-肾上腺素受体拮抗剂。

阅读理解

There would be a school party on Friday evening. The girls were talking about what they were going to wear.

“I’m going to wear a black dress, so everybody will notice me,” said Emily. “How about you, Linda?”

“I’m not sure. Maybe jeans, an old shirt, and a hat. People will notice me more than you!” Linda said.

“What are we going to do about the boys?” asked Jane. “Do you remember the last school party, last year? They just stood there, and we girls had to dance by ourselves!”

“I hear that some of the boys learned how to dance this summer. Maybe it’ll be better

this time,” said Mary.

The party was held on Friday evening. Groups of students arrived. The music began. The girls stood in a line on one side, and the boys on another side. Mr. Green, their teacher, tried to get them together, but failed. After a while, Tim said, “I don’t want to stand here the whole time. The party is only for two hours. It’ll be over soon.” He started to dance. All the others watched him. Then David asked Emily if she wanted to dance. Then Jack and Linda. Then, all began to dance. Soon there were more dancers than watchers.

小题1:Before the school party, the girls were mainly discussing __________.

A.the dance at the party

B.the teacher at the party

C.the dresses they would wear at the party

D.the boys at the party小题2: The girls wanted people to _________.

A.buy them some dresses

B.teach them how to dance

C.notice them

D.invite them to the school party小题3:. The teachers tried to ___________.

A.invite the girls to dance

B.play music instead of dancing

C.get the girls and boys to dance alone

D.get the girls and boys to dance together小题4: The party was ______________ last year.

A.better than

B.not so good as

C.as good as

D.as bad as

不定项选择