He’s She’s I’m
1. A: What are you doing?
B: ________ watching TV.
![](http://static.xuejinqu.com/qimg/0fb/0fbd6b2b2fda05c93240f1be33386b6e.png)
2. A: What’s Becky doing?
B: ________ singing.
![](http://static.xuejinqu.com/qimg/97d/97ddcb9d1b57fcff16baadc7dac8cea6.png)
3. A: What’s Sam doing?
B: ________ playing football.
![](http://static.xuejinqu.com/qimg/742/742fb8a51113abea0a229e9da92e42b6.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)