例:
![](https://img./dksih/QBM/2019/7/12/2245336612814848/2247964488851456/STEM/5619e7461caa4e1fa44acd261946cc7d.png?resizew=172)
It’s Thanksgiving.
It’s an American holiday.
It’s on the last Thursday of November.
We have a big family dinner.
We give thanks for our food.
![](https://img./dksih/QBM/2019/7/12/2245336612814848/2247964488851456/STEM/bb956b2d5e9345378e46c9a389131c0b.png?resizew=184)
1.It’s
2.It’s
3.It’s
4.We
5.We
![](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)