Directions: In this part, you are allowed 30 minutes to write a letter of about 100 words. You should write according to the following Chinese outline. Remember your letter must be written on the Answer Sheet.假设你是李夏，请你用英文写一封信，邀请外教Smith 教授参加你们班在"世界地球日"（4月22日）当天组织的登山活动。需要包括以下内容：1. 活动目的；2. 活动时间和地点；3. 注意事项。参考词汇：World Earth Day 世界地球日；mountain climbing 登山；environment 环境Dear Prof. Smith,How are you?

Dear Prof. Smith, How are you? I hope this letter finds you well. I am writing to invite you to join us for a special event that our class is organizing. As you know, April 22nd is World Earth Day, a day dedicated to raising awareness about environmental protection. To celebrate this day, we have planned a mountain climbing activity. Our aim is to not only enjoy nature but also to clean up any litter we find along the way, promoting environmental conservation. The event is scheduled to take place on April 22nd, starting at 9:00 AM. We will meet at the base of Mount Qingyun, which is about an hour's drive from the university. We plan to return by late afternoon. Please wear comfortable hiking shoes and bring a water bottle. We will provide garbage bags for the cleanup. It would be great if you could also bring a hat and sunscreen, as the weather can be quite sunny. We would be delighted if you could join us for this meaningful activity. Your participation would not only be a great encouragement to us but also help spread the message of environmental protection. Please let us know if you can make it by April 20th. Looking forward to your positive response. Best regards, Li Xia