搜索
A: Hello. Sarah. 1．
B: I'm looking at my postcards from China. Look at this one. It's a picture of the West Lake.
A: 2．
B: It's in Hangzhou. It's very beautiful.
A: Is this the famous Changjiang River?
B: Yes.it is.
A: 3．
B: It's more than six thousand kilometres long.
A: That's really long. 4．
B: Sure. Have you got any postcards from China?
A: No, I haven't. 5．
| A．How long is it? |
| B．Where is it? |
| C．But I have got some postcards from the US. |
| D．What are you doing? |
| E．These postcards are great. |
同类型试题
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
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
