问题 单项选择题

银杏叶中主要成分是

A.295~300nm
B.217~220nm
C.1700~1800cmˉ1
D.420nm
E.低40cmˉ1

答案

参考答案:B

解析:[解题思路] 黄芩中主要成分是黄芩苷,是黄酮-7-葡萄糖醛酸苷,苷元中有邻二羟基。黄芩苷经水解或酶解产生苷元不稳定,氧化成绿色邻醌。葛根中主要成分是大豆素、葛根素等,为异黄酮,葛根素是碳苷。银杏叶含多种黄酮,主要是黄酮(木犀草素:5,7,3′,4′-40H黄酮),黄酮醇(山柰酚:5,7,4′-30H黄酮醇,槲皮素:5,7,3′,4′-40H黄酮醇)及其苷类,还有双黄酮。D.陈皮苷是从陈皮中得到,是二氢黄酮苷。E.芦丁是槐米主要成分,是黄酮醇苷。

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If a person forgets names, places or facts —and has trouble with everyday things like reading or shopping —it may not mean you are getting old. It could be Alzheimer’s disease. So it’s important to see a doctor as soon as you can.

There is no cure for Alzheimer’s. But a drug called ARICEPT has been used by millions of people to help their symptoms (症状).

In studies, ARICEPT has been proved to work for Alzheimer’s . It has helped people improve their memory over time. It has also helped them to keep doing everyday things on their own.

Ask your doctor if ARICEPT is right for you or your loved one. It is the Number One drug for Alzheimer’s in the world. The sooner you know it’s Alzheimer’s, the better ARICEPT can help .

ARICEPT is good for many but may not be good for everyone. Some people may experience not sleeping well, feeling very tired, or not wanting to eat. In studies, these side effects weren’t serious at all and went away over time. Some people taking ARICEPT may feel light-headed. In this case you should tell your doctors because your condition may get worse.

小题1:If one suffers from Alzheimer’s, ________  .

A.he has trouble with his memory

B.he can’t do everyday things on his own

C.he often forgets things because he is old

D.he can’t move about小题2:What is ARICEPT?

A.A medicine to cure Alzheimer’s

B.A medicine to delay signs of aging.

C.A medicine to reduce the symptoms of Alzheimer’s.

D.A medicine to cure brain damage.小题3:One who is taking ARICEPT should go to see a doctor if he  ________ .

A.can’t fall asleep

B.feels tired out

C.has no desire to eat

D.feels like a drunken man