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In our school, there is a library. The library is not big. But it’s very nice. We often go to the library. We see many signs(标识) there. There are some “DOs” and “DON’Ts” in our library.
DOs | DON’Ts |
read books | eat and sleep |
walk quietly(安静地) | run and jump |
queue up(排队) | jump the queue(插队) |
talk quietly | shout |
| A．big and nice | B．big | C．nice |
| A．Yes. | B．No. | C．I don’t know. |
| A．talk quietly | B．jump the queue | C．shout |
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
