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Look the children. They are on the farm. What are they doing? Let's go and have a look.
Oh, you can't litter. Please put the rubbish in the bin. Boy, come here. Don't climb the tree. It's dangerous.
Can you walk on the grass and pick the flowers? I think you are not right. Look at the green grass and red flowers. They are nice.
Look at the ducks. They are lovely. You can't throw the stones to them. They are afraid.
Little girl, don't play with the water. We can not play in the pond. It's dangerous, too.
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
