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It was a fine day last Sunday. Wangling and I walked to the park together. We played football there. We had a lot of fun. Suddenly (突然) the football fell into the lake. We were sad. A dog saw it and jumped into the lake. He swam to the ball. and brought it back to us, “Good boy! Thank you!”, We said to the dog.
1．It was a bad day last Saturday.2．Wangling and Anna walked to the home together.
3．Wangling jumped into the lake.
4．A dog saw to the ball and brought it back to us.
5．We said to the dog “good boy! Thank you!”
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
