A. It’s so difficult. B. Now he is very tired. C. She is a clever girl. D. They were so afraid. |
1.They saw a very big dog.
![](http://static.xuejinqu.com/qimg/e97/e9753152785de20ffbcd5f60a2c6c463.png)
2.He can’t play the piano.
![](http://static.xuejinqu.com/qimg/c89/c893522b2b93959eee8ba93e60a7e533.png)
3.He worked all day.
![](http://static.xuejinqu.com/qimg/1e9/1e9ef13646fc9326399f1aeec34a7e49.png)
4.
![](http://static.xuejinqu.com/qimg/244/244a02bbd6c32e487a61a7ce1314f032.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)