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I have a friend. His name is John. He is a student. He is 11 years old, and he is tall. He lives in Canada. I often send postcards to him. I write an email on a computer to him every week. I bought a present for him yesterday. It is a stamp (邮票). I will send it to him tomorrow. I think he will be very happy.
1．John is my friend.2．John is twelve years old.
3．I write an e-mail on a computer to him every day.
4．I bought a stamp for John yesterday.
5．I think John will be happy.
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
