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要求：1. 建议至少三条，可适当发挥，但必须包含邮件所含的内容；
2. 词数80~100（邮件开头和结尾已给出，不计入总词数）；
3. 文中不得出现真实的人名、校名与地名。
| Dear Grace, How is everything going? I’m excited to tell you that I’m going to study in the US this September. But I’m a shy girl and don’t know how to make new friends there. What shall I do? Could you give me some advice? Li Hong |
| Dear Li Hong, I’m glad that you are coming to study in the US. Hope to see you soon! Grace |
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
