1.is, what, time, it (?)
![](http://static.xuejinqu.com/qimg/0ed/0ed1e8e9af846506485bbf311a25951c.png)
2.is, time, dinner, for, it (.)
![](http://static.xuejinqu.com/qimg/0ed/0ed1e8e9af846506485bbf311a25951c.png)
3.two, is, it, o'clock (.)
![](http://static.xuejinqu.com/qimg/0ed/0ed1e8e9af846506485bbf311a25951c.png)
4.run, us, let (.)
![](http://static.xuejinqu.com/qimg/0ed/0ed1e8e9af846506485bbf311a25951c.png)
![](http://static.xuejinqu.com/images/y-prise.png)
同类型试题
![](http://static.xuejinqu.com/images/medal.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)
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
![](http://static.xuejinqu.com/images/avatar.png)
![](http://static.xuejinqu.com/images/avatar.png)