假设你是导游James，现在有几名外国游客要去北京参观旅游。请你根据提示写一篇100词左右的英语短文，介绍一下北京的概况。文章开头结尾已给出，不计入总词数。
提示：
北京位于中国北部，是中国的首都城市，也是中国的政治中心；
美丽而且现代化，但是有太多的汽车，空气污染严重；
拥有悠久的历史，是一座古老的城市；有许多名胜可参观，如……；故宫曾是皇帝的家；秋天是北京最美的季节；
可以在“Travel in Beijing”这本书中了解更多情况。
词汇：政治中心 the political centre 皇帝 emperor
Hello, everyone! I am your tour guide James. In the following four days, I will show you around Beijing. First let me tell you something about Beijing.
Beijing,______________________________________________________________________________________
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Now, I will give each of you the tour book.
Hope you will have a nice time here!

假如你是一位导游，请根据下面游客的需求特点给他们从（A-G）中选择合适的旅游景点，其中有两项是多余的。

Beautiful waterfalls	Main features	Tips: Best time to go &Entry
(A).Detian Falls in Guangxi	The largest naturally formed falls in Southeast Asia	July-November 80 Yuan/person
(B).Hukou Waterfall in Shanxi	The second largest waterfall in China	April-May; 81yuan/person
(C).Jiulong Waterfalls in Yunnan	During rainy season, it is dyed red by the red earth it carries,	especially June and July; 10 Yuan/person
(D).Black Dragon Pool Waterfall in Tai Mount	Legend has it that the undersea dragon palace in East China Sea is connected with the pool, where dragons from the Sea can swim freely.	June-November 125 Yuan/person (Mar. - Oct.) 100 Yuan/person (Nov. - Feb.)
(E).Chishui Waterfall in Guizhou	It’s 76 meters high and 80 meters wide, an AAAA tourist attraction	July-October 40 Yuan/person
(F).Huangguoshu Waterfall in Guizhou	Was added to the Guinness book of world records as the world’s largest waterfall cluster.	summer and autumn, the rainy season，90 Yuan/person in peak season and 70 Yuan/person in off season
(G).Shiliang Waterfall in Zhejiang	There is a stone beam about seven meters long and 1/3 meter wide topping the waterfall, and the narrowest place is o­nly 1/6 meter wide.	60yuan Opening hours 6:00-19:00

小题1:Anna wants to go somewhere famous in the world.
小题2:David is a student in Yunnan Province, he doesn’t have much money.
小题3:Mr. Green is a busy businessman, he’s now in Taizhou, the day after tomorrow he will have to go back to his company in Beijing.
小题4:Grandpa Li likes travelling in spring.
小题5:Aunt Mary lives in Shandong, she hates to go for a long way, she often feels car sick.