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B: I can see an eraser on the desk.
A:
B: No. it isn’t.
A:
B: Maybe（也许）it’s in the schoolbag.
A: Oh, it’s a bookcase. Some books are in it. What’s that under the chair?
B: It’s a ball.
A: A ball?
B: Yes, it is.
| A．Where is it? |
| B．What’s that? |
| C．What can you see in the room? |
| D．Is it a soccer ball? |
| E．I have a soccer ball. |
| F．Is his English book on the desk? |
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
