为了使列表框中的项目分为多列显示，需要设置的属性为( )。A．Columns B．

如表是一个电饭锅的铭牌，从铭牌上的数据可知，电饭锅正常工作时的电流是 ___A，内部发热体的电阻是___Ω；

阅读下文，完成文后各题。

南极科考的四大谜团

未来数年内，南极科考研究将主要围绕四大待解之谜。

南极厚厚的冰盖下有一些已经被冰封了千百万年之久的湖泊。这些湖泊由活水河流网连在一起。到目前为止这样的湖泊已经发现了150个。其中最大的一个被称为沃斯托克湖。

长250千米，宽40千米，深0.4千米。科学家相信，湖泊中的一些独特的物种在不断繁衍进化。

冰盖将湖泊与外面的世界隔绝至少1500万年。目前，各国科学家面临的最大疑团就是沃斯托克湖还有没有我们所不知道的物种，这个谜又必须在不打开冰盖即不做出任何难以挽回的破坏的前提下来揭开，难度之大可想而知。

众所周知的南极上空的臭氧空洞，据推测其形成原因可能就是人类大量使用作为制冷剂和雾化剂的氟利昂。每年的8月下旬至9月下旬，在20千米高度的南极大陆上空，臭氧总量开始减少，10月初出现最大空洞，面积达2000多万平方公里。覆盖整个南极大陆及南美的南端，11月份臭氧才重新增加，空洞消失。其实，所谓臭氧空洞，并不是说整个臭氧层消失了，只不过是大气中的臭氧含量减少到一定程度而已。

研究发现，南极上空的臭氧空洞对海洋生物有很大的影响。强烈的紫外线可以穿透海洋10—30米，使海洋浮游植物的初级生产力降低了3／4，抑制了浮游动物的生长，从而对南大洋的生态系产生不利影响。

臭氧空洞与全球气候息息相关已被科学家们所证实，但还有一些谜团没有彻底解开。

比如，为什么在人类活动相对较多的北半球的北极上空没有出现臭氧空洞，而偏偏在南半球的南极上空出现呢?这个问题和“为什么北极只有北极熊而南极只有企鹅”一样，看似简单。却令人费解。

除此以外，南极板块运动会给地球带来怎样的影响和南极与全球环境变化的关系是另两大未解之谜，科学家们对此有许多猜想甚至预言。但都需要深入研究。

南极板块运动监测是国际南极地学界多年来关注的大尺度、长周期研究计划，对研究南极的环境变化有着重要意义。在1997年至2005年期间，科学家运用GPS卫星跟踪，对位于西南极的长城站和位于东南极的中山站进行了精确观测，揭示长城站年均运动量为1.85厘米，中山站年均运动量为0.87厘米，而年均运动量最大的是位于南极半岛地区的巴西费拉兹站，每年要“走”2.27厘米。

而南极冰盖为什么会消融?与全球环境之间有什么关系?至今还是一个需要深入研究的难题。这个问题在北极同样存在。有些科学家认为极地冰盖消融的变化是周期性的。但有些科学家则认为是趋势性的，如果是后者，那么人类赖以生存的地球环境将十分令人担忧。

（取材于戴劲松《未来数年南极科考拟破解四大谜团》）

小题1:下列理解，符合文意的一项是        （   ）

A．在南极环境不受任何破坏的前提下，只有设法打开冰盖，才能解开沃斯托克湖的谜

团。

B．南极所有观察站中，年均运动量最大的是巴西费拉兹站，年均运动量最小的是中山站。

C．对南极冰盖消融的问题进行深人研究，将有助于了解南极与全球环境变化之间的关

系。

D．无论极地冰盖消融的变化是周期性的，还是趋势性的，都将产生令人忧虑的严重后果。

小题2:根据文意，下列对“臭氧空洞”的理解，不正确的一项是（3分）（   ）

A．氟利昂的使用与臭氧空洞形成的关系还有待证实。

B．臭氧空洞每年出现的时间只有三个月左右。

C．人类活动相对较多的北半球的北极上空没有出现臭氧空洞。

D．臭氧空洞造成海下10—30米之间的浮游动物生长受到抑制。

阅读理解

     A primary school has banned Valentine's Day cards because of concerns that young pupils spend too much time talking about boyfriends and girlfriends.

     Ashcombe Primary School in WestonsuperMare, Somerset, has told parents that cards declaring love

can be "confusing" for children under the age of 11, who are still emotionally and socially developing.

     In his February newsletter (简讯), Peter Turner,head teacher, warned that any cards found in school

would be confiscated.

     He wrote, "We do not wish to see any Valentine's Day cards in school this year. Some children and

parents encourage a lot of talks about boyfriends and girlfriends."

      "We believe that such ideas should wait until children are mature enough emotionally and socially to

understand the commitment involved in having or being a boyfriend or girlfriend."

     Mr. Turner said any families wanting to support the Valentine's Day concept should send cards in the

post or deliver them to home addresses by hand.

     His views were supported by Ruth Rice, 46, who has twins Harriet and Olivia,9,at the school.

     She said, "Children at that age shouldn't really be thinking about Valentine's Day, and they should be

concentrating on their schoolwork."

      "They are at an age when they are easily influenced and most parents including myself are with

Mr. Turner."

      She added, "The cards caused too much competition. If someone gets a card and another doesn't then he will be disappointed."

      However, Rajeev Takyar, 40, who sells newspapers and has two children Jai, 11, and Aryan, 5, at the school, said he was "genuinely outraged"．

     He said, "There are schools that have banned conkers (康克戏) and snowballs, and now Valentine's

Day cards."

      "I think banning the cards stops children from having social skills. How are they going to learn about relationships otherwise? It's ridiculous."

     Alec Suttenwood, founder of the AntiPolitical Correctness Group, said of the ban, "It's totally

ridiculous. Young children just send the cards to each other as friends and to their parents. It's just a bit of harmless fun. There is no difference between this and Mother's or Father's Day."

1. Valentine's Day cards may cause confusion among young children because ________.

A. they are too young to understand what love is

B. teachers haven't taught them how to make friends

C. children shouldn't learn about social relationships

D. students talk too much about boyfriends and girlfriends

2. The underlined word "confiscated" in Paragraph 3 can probably be replaced by "________"．

A. collected                

B. destroyed            

C. taken away        

D. burnt away

3. Ruth Rice was in favor of Mr. Turner's view in that ________.

A. children like to compare Valentine's Day cards

B. children should focus their mind on their lessons

C. sending holiday cards waste both time and money

D. making friends has a negative influence on children

4. Which statement is TRUE according to the text?

A. Most of English parents want children to have fun.

B. Children should learn how to develop social skills.

C. English schools don't allow students to play games.

D. Some parents think it unreasonable to ban the cards.

5. What is the best title of the text?

A. School Bans Valentine's Day Cards

B. Shall We Send Valentine's Day Cards?

C. Different Opinions on Valentine's Day Cards

D. Parents' Concern about Valentine's Day Cards

不含硫元素的化合物是（）

A.大蒜新素

B.藻菜素

C.大蒜辣素

D.黑芥子苷

E.三七素

试论述对职工进行正确的心理引导所涵盖的内容。