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It is Sunday today. The weather is fine. Mingming and Dongdong are in the park. It is a big park. They can see many people there. They come here to have a rest after a week’s hard work and study. Some boys are playing football on the grass. Some girls are singing and dancing. An old man is reading a newspaper under a big tree. A young woman and her little son are playing with a toy bus. How happy they are!
1．Mingming and Dongdong are in a small park.2．Some boys are singing on the grass.
3．A young man and his child are playing with a toy bus.
4．There is an old man reading a newspaper under a big tree.
5．All the people in the park are 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
