2. 选B.由第2段的句子The temperature in the wetland is usually neither too high nor too low. There is a lot of rain and sunshine， too.可知，湿地的气温不高也不低，雨量充沛，阳光充足，这样的天气不是很pleasant吗？

1. 选A.从第1段的句子The Chinese Yellow Sea Wetlands are among them. They are in Yancheng， Jiangsu Province. 和地理知识可知，江苏省是在中国的东部，故选A.

5. The best title for the passage is _______.

　　 A. China‘s Wetlands Have All Entered the World’s List

　　 B. Wetlands-Home for Wildlife and Human Beings

　　 C. Special Animals in the Chinese Yellow Sea Wetlands

　　 D. Wetlands-Valuable Recourses(珍贵资源) of Land on the Earth

　　 「答案与解析」

4. We must protect wetlands because _______.

　　 A. they are home for wildlife

　　 B. they can prevent flood

　　 C. they can offer food to the animals and birds

　　 D. all of the above

3. The World Wetlands Day is on _______.

　　 A. April 22　　　 B. June 25

　　 C. February 2　　 D. March 22

2. Usually the weather in the wetlands is _______.

　　 A. hot　　　　　　 B. pleasant

　　 C. cold　　　　　 D. dry

　　 There are many wetlands(湿地) in China and some of them have become the world‘s important wetlands. The Chinese Yellow Sea Wetlands are among them. They are in Yancheng， Jiangsu Province. They are home for many different kinds of birds and animals. The world’s largest Milu Deer Nature Reserve(自然保护区) is in them. More than 700 milu deer live freely there. There are not many red-crowned cranes in the world， but every winter you can see some in the Red-crowned Cranes Nature Reserve in the Yellow Sea Wetlands.

　　 The temperature in the wetlands is usually neither too high nor too low. There is a lot of rain and sunshine， too. They are really good places for wildlife(野生生物)。 Offering food and home for some special kinds of animals and birds is not the only reason why we need to protect wetlands. Wetlands are important because they also prevent flood. But some people want to change the wetlands to make more space for farms and buildings. This means there will be less and less space for wildlife.

　　 Luckily， more and more people are beginning to realize the important of wetlands and wildlife. Every year， on February 2nd， many activities are held to tell people more about wetlands.

　　 根据以上短文内容，然后从每题所给的四个选项中选择最佳选项。

1. The Chinese Yellow Sea Wetlands are in the _______ of China.

　　 A. east　　　　　 B. south

　　 C. west　　　　　 D. north

22.(本小题满分14分)

已知二次函数f(x)=ax²+bx+c的图象的顶点坐标是(),且f(3)=2.

(1)求y=f(x)的表达式，并求出f(1),f(2)的值；

(2)数列{a_n}，{b_n}，若对任意的实数x都满足f(x)g(x)+a_nx+b_n=xⁿ+1,n∈N^*，其中g(x)是定义在实数集R上的一个函数，求数列{a_n},{b_n}的通项公式；

(3)设圆C_n:(x－a_n)²+(y－b_n)²=r_n²，若圆C_n与圆C_n+1外切，{r_n}是各项都是正数的等比数列.记S_n是前n个圆的面积之和，求(n∈N^*).

21.(本小题满分12分)

如图，已知△ABC的三边分别为a,b,c，A为圆心，直径PQ=2r，问P,Q在什么位置时，有最大值？

20.(本小题满分12分)

已知函数f(x)=2x³+ax,g(x)=bx²+c的图象都过点P(2，0)，且在点P处有公切线，求a,b,c及f(x),g(x)的表达式.