已知log2a+log2b≥1，则3a+9b的最小值为______．

阅读理解。

     Most people feel lonely sometimes, but it usually only lasts between a few minutes and a few hours. This

kind of loneliness is not serious. In fact, it is quite normal. For some people, though, loneliness can last for

years. Now researchers say there are three different types of loneliness.

     The first kind of loneliness is temporary (暂时的). This is the most common type. It usually disappears

quickly and does not require any special attention. The second kind, situational loneliness, is a natural result

of a particular situation-for example, a family problem, the death of a loved one, or moving to a new place.

Although this kind of loneliness can cause physical problems, such as headaches and sleeplessness, it usually

does not last for more than a year. The third kind of loneliness is the most severe. Unlike the second type,

chronic (长期的) loneliness usually lasts more than two years and has no specific cause. People who

experience habitual loneliness have problems socializing and becoming close to others. Unfortunately, many

chronically lonely people think there is little or nothing they can do to improve their condition.

     Psychologists are trying to find ways to help habitually lonely people for two reasons: they are unhappy

and unable to socialize and there is a connection between chronic loneliness and serious illness such as heart

disease. While temporary and situational loneliness can be a normal, healthy part of life, chronic loneliness can

be a very sad, and sometimes dangerous condition.

1. How would you treat temporary loneliness according to the passage? [ ]

A. Talk to friends.

B. Just ignore it.

C. Go to see a doctor.

D. Ask your teachers for guidance.

2. "It" in the last sentence of the second paragraph refers to _____. [ ]

A. temporary loneliness

B. situational loneliness

C. a new place

D. sleeplessness

3. Why do psychologists want to help chronically lonely people? [ ]

A. Chronic loneliness can cause family problems.

B. Chronic loneliness can cause serious illness.

C. Chronic loneliness can not be overcome.

D. Such people are harmful to society.

4. What is the best title for the passage? [ ]

A. Three kinds of loneliness

B. Loneliness and Diseases

C. Loneliness and Social Contacts

D. Chronic Loneliness

服务人员要通过接待服务，不断地向客人提供（）。

A、优雅的客房环境

B、舒适的休息空间

C、清洁卫生的客房

D、使用价值和劳务

A企业2007年1月1日从B企业购入一项专利的所有权，以银行存款支付买价和有关费用共计80000元。该专利权的摊销年限为8年，该企业对无形资产采用直线法进行摊销。 2009年1月1日，A企业将上项专利权的所有权转让给B企业，取得转让收入70000元 (已存入银行)，该项目收入适用的营业税率为5%。
要求：
(1) 编制A企业购入专利权的会计分录。
(2) 编制2007年无形资产摊销的会计分录。
(3) 计算该项专利权转让时的摊余价值。
(4) 编制转让该项专利权的会计分录。

颌面部间隙感染来自（）

A.牙槽、牙周、冠周炎症

B.下颌骨髓炎

C.颌面淋巴结炎

D.涎腺炎

E.颌部外伤

水不仅是细胞代谢所需的原料，也是（）的产物，如有氧呼吸、蛋白质与DNA的合成过程中都有水的生成。