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Tom is seven years old. He is a good boy. But he can not get up early. He sleeps until nine or ten o'clock in the morning. He is often late for school.
Tom’s mother doesn’t want him to be late for school. So she buys him an alarm clock. She says to Tom, “You must get up when you hear the clock ring.”
“Yes, Mum.” says Tom. After that Tom gets up at six thirty when he hears the clock ring.
One day his mother forgot to wind up the clock. And the next morning Tom didn’t get up at six thirty. It was time for breakfast. His mother went to see him. Tom was in bed and his eyes were open.
“Why don’t you get up?” His mother was angry.
“You told me I must get up when I hear the clock ring. So I am waiting for the bell.”
1．Tom’s mother buys him a clock, because ________. ( )| A．Tom likes it very much |
| B．she likes it very much |
| C．she doesn’t want him to be late for school |
| A．6:30 | B．6:13 | C．6:00 |
| A．the clock didn’t ring |
| B．his head hurts a lot |
| C．he was still asleep |
| A．Because it was broken |
| B．Because Tom turned it off |
| C．Because Tom’s mother forgot to wind it up. |
| A．Tom got up |
| B．Tom was awake with his eyes open |
| C．Tom was sleeping in his bed |
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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
