问题 单项选择题

水提醇沉法不能除去的杂质是

A.蛋白质

B.多糖

C.鞣质

D.黏液质

E.淀粉

答案

参考答案:C

解析:水提醇沉法(水醇法)系指利用多数中药有效成分既可以溶解在水中,也可以溶解在适当浓度乙醇中的特性,在中药水提浓缩液中加乙醇使其达到适当的浓度,高分子杂质沉淀析出,经固液分离达到精制目的的方法。可除去蛋白、多糖、黏液质和淀粉等,不能除去鞣质。选C。

阅读理解

阅读理解。

     Most American families are smaller than the families in other countries. Most American families have one

or two parents and one or two children each.

     Children in the US will leave their parents' home when they grow up. They usually live far from their

parents because they want to find good jobs. They often write to their parents or telephone them. And they

often go to visit their parents on holiday.

     Parents usually let their children choose their own jobs. Americans think it important for young people to

decide on their lives by themselves.

     Children are asked to do some work around their house. And in many families, children are paid for doing

some housework so that they learn how to make money for their own use.

1. The size of most American families is ______ that of other countries. [ ]

A.larger than

B.smaller than

C.as big as

D.as small as

2. When children grow up,they leave their parents' home to ______. [ ]

A.get married

B.be free

C.find good jobs

D.go to university

3. They visit their parents ______. [ ]

A.on weekdays

B.on weekends

C.on holiday

D.very often

4. In America, children are allowed to ______.[ ]

A.choose their own jobs

B.get pay for doing house work

C.1ive with their parents when they grow up

D.Both A and B

5. Which of the following statements is WRONG? [ ]

A.Children have the freedom to choose their own job.

B.Parents don't ask their children to do the housework.

C.Parents think it important for children to make their own decision.

D.Children in America have chances to learn to make money at home.

单项选择题 A型题