色素痣的细胞来源（） A.痣细胞 B.表皮黑色素细胞 C.内皮细胞 D.真皮黑色素细

第二节：书面表达（满分30分）
假如你暑假期间要去英国Embassy English Language School （EELS）进行短期学习。以下是英方学校寄给你的课程安排选择表。请你仔细阅读课表，按要求给校方回复一封信。

Schedule for EELS Summer English Courses
English Courses	Total Hours of Study	Total Hours of Part-time Job	Date
Six-week course	120	48	July 1 — August 15
Four-week course	60	No Job but Tour Instead	July 1 — August 1

Please include the following:
1．Your choice of the courses and possible reasons
2．Your present English level
3．Specific language skill you hope to improve
4．Other requirements
注意：1．信的开头已为你写好；2．词数：120左右
Dear Sir or Madam,
Thank you for your offer inviting me to the summer English course in your school．       
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Truly yours,
Li Hua