（本题12分）定义在R上的函数，已知在上有最小值3。

（1）求的单调区间；

（2）求在上的最大值。

下面来自哥本哈根的一则报道：

COPENHAGEN：No matter what the outcome of the UN climate change conference is, China will remain committed（尽…义务）to achieving the emission reduction targets（减排目标）it has said for itself, Premier Wen Jiabao said on Friday．

“We will honor our word with real action，”Wen told 119 heads of state and government attending the UN climate change conference，or COP 15．

Before the conference began，China announced that it would reduce its carbon intensity emission by 40 and 45 percent by 2020．

Wen then met US President Barack Obama for nearly an hour in what a White House official described as a“step forward”．“But Obama refused to commit to new emission cuts, a move that many said could have saved the struggling climate talks．

假如你叫李华，在看完这则报道后用英语给出席“哥本哈根联合国世界气候变化大会”（Copenhagen）The 15th United Nations Climate Change Conference，or COP 15的各国首脑写封信，代表中国的中学生陈述你们对世界环境问题的关注和对本次大会的期待。文章应包括以下要点的内容，不必逐字翻译，字数在120左右．

1．经济发展决不能以牺牲环境为代价，降低排放，减少温室效应（green house effect）是本世纪人类面对的最大挑战．（challenge）

2．几十年来，中国政府在改善环境方面的努力有目共睹，本次大会，中国提出了最高的减排目标，起了带头作用．

3．自己亲身体验到了学校周边自然环境的变化．

4．发达国家应当有勇气承担更多的责任

5．作为未来的主人，真诚希望各国的领导人立即行动起来，共同合作，不要把问题留给下一代人．

开头已写出：

Dear Sirs／madams，

As Chinese teenagers，we are most concerned about the opening of COP 15 in Copenhagen

阅读下面短文，然后按要求写一篇150词左右的英语短文
In China,with one or two parents going out to earn money,many children are left in their hometown in the countryside.These children are called “leftover children”.A large number of leftover children have emerged since 1978,and the statistics showed in 2004,the total was 22 million.
Usually their grandparents or their parents’ friends or relatives look after these leftover children.Sometimes they are brought up by one of their parents at home.In most cases,their guardians are not quite educated.To them,making sure that the children are healthy and fed well is the most important task,and that the children are safe and sound is considered to have done a good job.But they seldom care about children’s study,their psychological needs,or mental demands.Neither do they spend some time teaching kids how to develop good habits.
Therefore,for most of the time,the leftover children can’t get emotional support from their parents,which can result in so many problems.
【写作内容】
1.以约30个词概括短文的要点；
2.然后以约120个词就“如何关心农村留守儿童（leftover children）的成长？”的主题发表看法，并包括如下要点：
（1）农村留守孩子存在的原因；
（2）你认为他们面临的最大困难是什么；
（3）解决留守儿童问题的关键是什么；
（4）提出解决问题的措施。
【写作要求】
1.你可以使用实例或其他论述方法支持你的论点，也可以参照阅读材料的内容，但不能直接引用原文的句子；
2.题目自定。
【评分标准】
概括准确，语言规范，内容合适，篇章连贯。

近来你班上同学关系不太融洽，老师要求你在班会上就“友谊”发表讲话，鼓励大家要珍惜友谊，包括如下内容：

1. 友谊是人与人的关系，交朋友是人的本性（instinct）；

2. 友谊的作用：有困难时友谊如何给我们予帮助；成功时朋友可以分享幸福；

3. 友谊是我们的最大快乐之一，在人生道路上没有得到友谊，就没有真正地拥有生活。

4. 号召大家要珍惜友谊。

【写作要求】

    只能使用5个句子表达全部内容。

读写任务（共1小题，满分25分）
在全国“两会”上，“农村留守儿童” 问题成为人大代表和政协委员普遍关注的热门话题之一。请阅读下面的短文，然后按照要求写一篇150词左右的英语短文。
In China, with one or two parents going out to earn money, many children are left in their hometown in the countryside. These children are called “leftover children”. A large number of leftover children have emerged since 1978, and the statistics showed in 2004, the total is 22 million.
Usually their grandparents or their parents’ friends or relatives look after these leftover children. Sometimes they are brought up by one of their parents at home. In most cases, their guardians are not quite educated. To them, making sure that the children are healthy and fed well is the most important task, and that the children are safe and sound is considered to have done a good job. But they seldom care about children’s study, their psychological needs, or mental demands. Neither do they spend  some time teaching kids how to develop good habits.
Therefore, for most of the time, the leftover children can’t get emotional support from their parents, which can result in so many problems.
[写作内容]
1. 以大约30个词概括短文的内容。
2. 然后以约120个词就“如何关心农村留守儿童（leftover children）的成长？”的主题发表看法，并包括如下要点：
1）农村留守孩子存在的原因是什么。
2）你认为他们面临的最大困难是什么。
3）解决留守孩子问题的关键是什么, 提出解决问题的措施。
[写作要求]
1. 你可以使用实例或其他论述方法支持你的论点，也可以参照阅读材料的内容，但不能直接引用阅读材料的句子。
2. 题目自定。
[评分标准] 
概括准确、语言规范、内容合适、篇章连贯。
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