
A: Oh, it's a nice photo.
B: Yes, I took it at Century Park.
A: Century Park? Really?
B: It's very interesting.
A: Who is she?
B: She's my sister, Mary.
A: Where is she?
B: She's on the swing. She's happy.
A: Who's this boy?
B: He's my cousin, Peter.
A: Where is he?
B: He's in the plant house.
A: How about this boy?
B: Oh, I don't know. But he can play football very well.
A: Is this a fountain?
B: Yes, it's a small fountain. There are three fountains there. And three ponds.
A: Are they birds?
B: Yes, they are in the aviary.
A: Can you feed them?
B: No, we can't feed them.

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

