某弱酸性药物的pKa是3.4,在血浆中的解离百分率约为() A.1% B.10% C

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问题:

某弱酸性药物的pKa是3.4,在血浆中的解离百分率约为()

A.1%

B.10%

C.90%

D.99%

E.99.99%

考点:皮肤科住院医师临床药理学(综合练习)临床药理学(综合练习)题库
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— ____ sweep the classroom yesterday?

—I was playing tennis with my friend.

A.Why not

B.Why didn't

C.Why don't

D.Why didn't you

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Most people agree that it’s important to have a sense of humor. Having the ability to laugh can help one overcome anxiety, and make better decisions in difficult situations. People with a well-developed sense of humor appear to be happier, and some are healthier as well. This suggests that having a sense of humor is good for you. Humorless people may find themselves being treated as a fool, and become anxious and upset.

A sense of humor also plays an important role in human relationships. However, not everyone has a sense of humor. People with developmental disabilities (发展性能力丧失) can sometimes have no sense of humor, or have a very strange one.

A number of factors affect a person’s sense of humor, with the age probably being the main one. Young children are often highly amused by simple jokes or shows, while teenagers prefer to enjoy the ironic (讽刺的) events. Educational level, culture, and religious faith also affect one’s sense of humor. While Christians, for example, may have a deep appreciation of jokes about the Bible, others may find them disrespectful.

Many people believe that a sense of humor is something that develops on its own, and that you cannot teach someone to understand why jokes, certain comments, situations or events are funny. However, things can be done to enhance one’s sense of humor. Children, for example, benefit from being told jokes and encouraged to laugh, although some children’s jokes might seem rather strange to adults. If you have children, try to encourage them to tell jokes and think about what makes things funny. And it will help them develop a sense of humor.

小题1:The purpose of the passage is to _______.

A.explain what influences a person’s sense of humor

B.tell readers the importance of being healthy

C.explain how to make better decisions

D.tell readers how to understand jokes小题2:What does the underlined word in Paragraph 4 “enhance” probably mean?

A.Enjoy.

B.Reduce.

C.Improve.

D.Prevent.小题3:According to the passage, which of the following isn’t talked about in our passenger?

A.Culture.

B.Age

C.Educational level.

D.Family backgrounds.

题型:单项选择题

在气雾剂组成中,有关抛射剂的叙述,错误的是()

A.抛射剂是喷射药物的动力

B.抛射剂可作为气雾剂中药物的溶剂

C.抛射剂可作为气雾剂中药物的稀释剂

D.抛射剂是一类高沸点的物质

E.抛射剂在常温下蒸气压大于大气压

题型:单项选择题

下列关于种群密度的说法,不正确是()

A.它是种群最基本的数量特征

B.一般用样方法调查双子叶草本植物的种群密度

C.其调查一定要做到随机取样

D.动物种群密度的调查方法只有标志重捕法

题型:单项选择题

科技部网站《国家中长期科学和技术发展规划纲要2006━2020年》提出的前沿技术中的新材料技术包括()。

A.智能材料与结构技术

B.高温超导技术

C.高效能源材料技术

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