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Jack is a lovely boy. He likes playing ping-pong very much. He often comes back home at 4:30 pm. One day he comes back late. His mother says, “You come back home late today, Jack.’’
“Yes, we have a new Maths teacher,” Jack answers.
“How is he?” his mother asks.
“I don’t know,” he says.
“How is that?” his mother asks.
“One moment (时刻) he says four plus four is eight, and the next moment he says one plus seven is eight,” Jack says.
1．Jack often comes back home at __________. ( )| A．4:00 pm | B．4:30 pm | C．4:50 pm |
| A．Because he plays football. |
| B．Because he doesn’t like going home. |
| C．Because he has a new Maths teacher. |
| A．Seven. | B．Eight. | C．Ten. |
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
