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假定你是李华，近日你校开展了以“热爱劳动，珍爱粮食”为主题的实践活动。请你结合以下图示，用英语给笔友John写一封信，分享活动过程和感受。词数80左右。
注意事项：
1.必须包含所有提示信息，可适当发挥，开头已给出，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姓名和校名。
Dear John,
How is everything going?
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Yours,
Li Hua
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
