Robby the Rabbit had a bad day. He lost a present for his friend, Terry the Turtle. Where was it? He mustn't lose it. He must find it. Terry's birthday was today.
He walked quickly to the subway. Did he drop it there?
No. There was no present.
He carried it near the harbour. Maybe it was there. No.
His present wasn't there either but there were plenty of people. Maybe someone picked up his present.
Robby went into the shopping mall. There were lots of presents. He looked carefully but he didn't see his present. He went to the toilet. What did he see? His present for Terry. He found it! It was a good day after all.
A B
C D
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