答案：
　　1-5．DDBDB　　　 6-10．DBBCB
　　11-15．BCADC　　16-20．CADDA
　　21-25．DDBCA　　26-30．CBCDA
　　31-35．BBCAD　　36-40．ABACC
　　41-45．ADADA　　46-50．CCBBC
　　51-55．ABCAA

　　[高分范文]
　　Dear Mr.Stevenson,
　　We are very glad to hear that you-the Britain Children Chior will visit our school.Welcome!I,representing our school,will receive you.I am pleased to tell you the trip plan.
　　I will pick you up at the airport on July 23rd,and then take you to live in the Xin Hua Hotel,where you can have a good rest.On the morning of 24th,we will visit our school and have a great dinner.Our headmaster will make a speech.At 7:00 p.m. we will watch a performance.The next day,we will visit the Tian’anmen Square,the Palace Museum and the National Museum.On 26th ,I will see you off.
　　I hope you can have a good time.Best wishes to you.