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I had got a good friend two years ago. It was a cute dog. Its name was Doudou. I often went to the park with Doudou. Doudou could run very fast. It was white. I gave it some chicken to eat every day. It liked chicken very much. I loved it. One day, Doudou was lost. I was very sad.
1．Doudou was my friend.2．Doudou was a white dog.
3．Doudou could run fast.
4．Doudou liked chicken very much.
5．I can play with Doudou now.
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
