5. 钝角△ABC中，，则的面积等于　 ( B　 )

　　 A．　　　　 B． 　　　　 C．　　　　 D．

[解析]由正弦定理得，∴(舍去)或，

∴，的面积为.

4．，，则　　(　A　)

A．　　B． 　　C．　　D．

[解析]由解得，∴，

解得，∵，∴，

∴

3.　 已知，则的图象　 ( C　 )

A．与的图象相同　　　　　　　　　 B．与的图象关于轴对称　

C．向左平移个单位，得到的图象　 D．向右平移个单位，得到的图象

[解析]化简得，，易知C正确．

2. 已知，则　　　 ( B )

A．　　 B．　　 C．　　 D．

[解析]方法一：∵

∴

　　　 ．

方法二：∵，∴．

∴

．

1．已知，，则　　 ( C )

A．　　　　　 B．　　　　 C．　　　　 D．

[解析]

目前，西南大旱牵动了无数人的心。近日一网友发了一份“网络祈雨”倡议书：希望大家团结起来，用最古老的抗旱方法“祈雨”。　针对上述行为及以下两幅图用英语写一篇短文。

注意：

1. 仔细品味图中的韵味，要适当发挥想象，不要做简单描述。

2. 词数150左右。开头已经写好，不计入总词数。

3. 作文中不得提及考生所在学校和本人姓名。

参考词汇：干旱 drought　　 古老 primitive

At present, everyone is greatly concerned about the southwest drought. 　　　

At present, everyone is greatly concerned about the southwest drought. Some think we can fight the drought by praying for rain by means of the Internet--using the modern tool to do the primitive thing, which I think is in vain. Faced with the terrible drought, we should take effective measures to settle the issue.

Firstly, we must protect trees. Trees play an important part in water and soil conservation. People are suffering from the drought because plenty of trees have been cut down without limits. If we continue to do so, we will be punished by nature. Secondly, we should try to save water. Water is a necessity in our daily life. Besides, water resources are limited, so we shouldn't waste it. If we don’t kick the bad habit of wasting water, we will surely suffer more in the future.

　It's never too late to mend. After the disaster, we should realize protecting nature means protecting ourselves. Only in this way can we live a better life in the future.