1.The cat is sleeping.
![](http://static.xuejinqu.com/qimg/531/531582dce9a2c9f902f58aed90ecbe61.png)
2.He is eating.
![](http://static.xuejinqu.com/qimg/270/2707d5f96e510c4d9daa6d134ae89c8e.png)
3.The bird is flying.
![](http://static.xuejinqu.com/qimg/2cd/2cd2feeec578b9d3d5ccab8222849fae.png)
4.Tom's mum is watching TV.
![](http://static.xuejinqu.com/qimg/dd8/dd8c3112fd4173f9e0cc9d0933b6e1c3.png)
5.Peter's sister is writing.
![](http://static.xuejinqu.com/qimg/ea5/ea57abadbe621c96f62bf9e6696236c6.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)