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It's Saturday today. It is fine. Li Dong and his classmates are in the park. They are playing games. Zhao Yu is on the swing（秋千）. Xu Fang and Liu Mei are jumping ropes. Li Ting and Ma Wei are listening to music. Look! Li Feng is running. Liu Nan is playing games with some other children under the tree. How happy they are!
1．It's Saturday today. （_______）2．Li Dong and Zhao Yu are classmates. （_______）
3．Xu Fang is on the swing. （_______）
4．Li Feng is sleeping. （_______）
5．The children are all very 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
