( ) 1. — We have a board in our classroom. A
![](http://static.xuejinqu.com/qimg/6fe/6fe420fc837339b4bd07b1dc2a4f1a4e.png)
—Wow, it’s so big.
( ) 2. — Let’s clean the window. ! B
![](http://static.xuejinqu.com/qimg/813/81368981ea2d748348093a0c6d9a8c81.png)
— OK.
( )3. —What’s it? C
![](http://static.xuejinqu.com/qimg/f9a/f9a834b563be7a4135d152479d96f5f3.png)
—It’s a chair.
( )4.—What are they? D
![](http://static.xuejinqu.com/qimg/b5c/b5cacd29a1d048de904c905077840d78.png)
—They are cats.
( )5. —What’s in your classroom? E
![](http://static.xuejinqu.com/qimg/3ba/3ba3e28964743ab17dde378a94a292b4.png)
—A new desk.
![](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)