Doudou: Mum, I had a good dream last night.
Mum: Really?
Doudou: Yes, I went to the moon.
Mum: Wow!
Doudou: Yes, they lived on the moon happily.
Mum:
Doudou: Yes, I liked them very much. They were very nice.
Mum: Did you make any friends?
Doudou:
Mum:
Doudou: No, I travelled by spaceship(飞船).
Mum: That’s nice. You had a good dream.
A.But they weren’t very beautiful. |
B.And did you travel by plane? |
C.Did you see any people there? |
D.Yes, I did. |
E.Did you like them? |
![](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)