( )1.—What are you doing?
![](http://static.xuejinqu.com/qimg/1cd/1cd8d65dd75a9b84f9c15f0a9bdb6763.png)
—I'm playing basketball.
( )2.—What is he doing?
![](http://static.xuejinqu.com/qimg/562/56248a8e1b78ee7674b8b49ecd3c1b75.png)
—He is listening to music.
( )3.—What is she doing?
![](http://static.xuejinqu.com/qimg/42f/42ff3df26beb5999ea286333920eb543.png)
—She is watching TV.
( )4.—What is your sister doing?
![](http://static.xuejinqu.com/qimg/085/085af13b8f575a1d22d050bc487f752a.png)
—She is doing her homework.
( )5.—What are they doing?
![](http://static.xuejinqu.com/qimg/99d/99d521b1a81e164c416f856d33f105a7.png)
—They are riding a bike.
![](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)