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假如你是李明，你的美国朋友David 向你了解暑假社会实践活动的计划，请结合下表内容写一封邮件向他介绍你的计划。
Social Practice Plan | |
What to do | Why to do so |
| ●volunteer to do... ●make a survey about... ●have a graduation trip to... ●… | ●be helpful... ●learn more about... ●open one’s eyes... ●… |
1）文中必须包含至少两项活动的内容要点，可适当发挥；
2）文中不得出现真实姓名、学校等信息；
3）词数：80~ 100；邮件的开头与结尾已给出，不计入总词数。
 |
| Dear David, Glad to share my social practice plan with you. _______________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________ Looking forward to your reply. Yours, Li Ming |
同类型试题
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
y = sin x， x∈R， y∈[–1，1]，周期为2π，函数图像以 x = (π/2) + kπ 为对称轴
y = arcsin x， x∈[–1，1]， y∈[–π/2，π/2]
sin x = 0 ←→ arcsin x = 0
sin x = 1/2 ←→ arcsin x = π/6
sin x = √2/2 ←→ arcsin x = π/4
sin x = 1 ←→ arcsin x = π/2
