阅读下列短文,从每小题所给的A、B、C、D四个选项中选出一个最佳选项。

Dear Bill

    Thank you for your letter（信件). You tell me something about your family. Now I'll talk about my family.

    I have a happy family. We love each other. My grandparents are doctors. They work in Canada now. My parents are both teachers. They teach English at Luoyang International School. My sister and I are in Luoyang with them.

    I'm 13 years old. I'm a student in Grade Seven. I like my teacher and my friends in China . They often help me. I want to be a Chinese doctor when I grow up . Now I can speak Chinese. My sister, Jane, is only three years old. She is very cute . She has brown hair and blue eyes. We all love her.China is very beautiful. Welcome to China.

Yours

Frank

学生会要表彰一批优秀学生，Tom想推荐他的同学John竞争最乐于助人奖(Most Helpful Student Award)。请以Tom的名义给学生会主席写一封推荐信。词数约80，不包括已给出的开头和结尾。
推荐信中必须包括下列要点：John
1、有礼貌，勤奋，乐于助人，常帮助同学学习
2、聪明，记忆力好，学东西很快
3、经常为希望工程募集物品，照顾老年之家的老人
4、电脑用得好，经常为帮扶俱乐部(the Helping Hands Club)从网上获取资料
5、上周，一个小男孩迷路，John将他送回家，男孩的父母很感激他。
Dear Sir
I would like                                                              
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
                                                                        
We will be glad if he can win the award.
Thank you
Yours faithfully
Tom
Best wishes for you!  Hope to see you soon!

战国时期，在今河南一带的商业中心，可以买到西方的皮革、东方的鱼盐、南方的象牙、北方的马匹。这表明此地区（    ）