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I have a cousin. He is only four years old. Today I go to a library with him. He doesn't know the signs. I tell him about the signs. This sign means "Be quiet". We should not shout in the library. That sign means "No eating or drinking". We can't eat or drink here. My cousin knows a lot about the signs in the signs in the library after I tell him.
1．My cousin is five years old.2．We are in the supermarket.
3．My cousin knows a lot about the signs in the signs in the library after I tell him.
4．We can eat and drink in the library.
5．We shouldn't shout in the library.
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
