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| Dear editor, I am a middle school student. I am shy and lonely. I have only one friend, I want to make more friends. But I do not know how to talk to others. Can you help me? Lily |
要求：
1. 书信格式正确。
2. 回信需包括以下要点：
1) Lily的这种烦恼比较常见，勿需担心；
2)请给出三条建议；
3)回信结尾请给予她鼓励。
3. 词数：80左右。
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
