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Look at this. It's a pencil case. It's orange. It's my pencil case. What's in it? Look, this is a pen. It's black. This is a pencil. It's red. And this is a ruler. It's green. This is an eraser. It's blue and white. My pencil case is big and nice. I like it.
1．My pen is black.2．This is an orange pencil case .It's small and nice.
3．There is a pen,a pencil,a ruler,and an eraser in it.
4．My eraser is blue and black.
5．I like my case.
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
