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| From: MaryTo: Li Qian |
| Subject: an American friend |
| Hello, Lucy. I am Mary. I am 12 years old. I am from Canada. I live in Toronto. My favorite animal is polar bear. I like reading books in my study. I also like playing the piano. Christmas is the most important festival(重要节日) in our country. We always have a lot of fun at Christmas. It often snows in winter here. I like making snowmen. I think China is an eastern(东方的) country with a long history(历史). I hope(希望) I can visit China someday, and study Chinese with you. |
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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
