问题 问答题 简答题

详述天麻对中枢神经系统的作用以及作用机理。

答案

参考答案:天麻及其有效成分可以产生镇静、抗惊厥、保护脑细胞、改善记忆等中枢效应。其镇静效应机理与兴奋苯二氮一受体、降低多巴胺与去甲肾上腺素含量有关。脑保护作用来源于对抗谷氨酸作用,降低LPO生成。改善记忆与清除自由基能力有关。

综合
阅读理解

Dear Sir

I’m interested in the furnished (备有家具的)house near Dedham which you made known in yesterday’s paper, for my husband and I are coming to England in June and need accommodation(住所)for three months. Would you please tell me exactly where it is and give me details (细目)of bus and train services in the area ?We need a house on a busy street. And I would also like to know about the local(当地的)shops. Do the local shops still supply? I know they did ten years ago. 

I would be thankful also if you would tell me whether you supply sheets etc, and whether a laundry(洗衣房)calls at the house. The rent (房租)you ask sounds reasonable for the size of the house. How do you like it paid? Weekly, monthly or in advance (提前)?

I would be thankful for an early reply.

Yours

Pamda Smith

1.Pamda Smith got the news about the house from      . 

A.local shops       B.a newspaper     C.her friends       D.a telephone

2.Most probably, Mr and Mrs Smith      . 

A.are coming to England from America    B.want to live in a beautiful place

C.are very rich           D.once lived in Dedham ten years ago

3.How do they need a house on a busy street?

A.The rent is the cheapest   B.There is a laundry

C.They like the busy area very much  D.They don’t want to drive

4.Which of the following is not true? Mr. and Mrs. Smith     . 

A.are not clear about the rent     B.Want to be in England for three months

C.will be on holiday in England       D.do not want to wash their clothes

5.In the passage, the word “accommodation” means      . 

A.cool weather    B.good service     C.furnished rooms      D.beautiful scenes