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假定你是李华，收到你新交的笔友John的邮件，请根据邮件内容给他回复。词数80左右。
| To: Li Hua2023@126.com From: John@hotmail.com |
| Dear Li Hua, I’m glad to hear from you. You told me that your life has changed a lot after you became a 9-grader. What did you use to be like? What is the most important change? And how did it happen? It might be a story behind it, right? Looking forward to hearing from you. Yours, John |
1. 回复邮件时可适当发挥，邮件格式已给出，不计入总词数；
2. 意思清楚，表达通顺，行文连贯，书写规范；
3. 请勿在文中使用真实的人名、校名及地名。
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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
