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It’s five o’clock in the afternoon. The children are cleaning the classroom. Look! Xiaoxue and Maomao are cleaning the windows. Oh, the windows are too high. Maomao needs some help. Xiaoqiang can help her clean them. Feifei and Pengpeng are cleaning the floor. Pingping is cleaning the desks and the chairs. John is carrying water with Tom. They are very tired, but they are very happy. Now the classroom is clean and bright.
1．It’s four o’clock in the afternoon.2．Xiaoxue and Maomao are cleaning the windows.
3．Xiaoqiang can’t help her clean the windows.
4．Feifei and Pengpeng are cleaning the desks and the chairs.
5．Now the classroom is bright and clean.
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
