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Jack is not good at maths. He doesn’t like to go to school. He can only count from 1 to 10.
One day, Jack’s teacher says to him, “All the boys and girls in our class work hard, but you don’t. What can you do when you grow up? No job suits you.”
“There is one job I can do. I like watching TV every day. I know a lot about sports. I am goingto be a referee(裁判员),” Jack says.
“What referee are you going to be?” the teacher asks. “A boxing(拳击) referee,” Jack answers.
“Why?” asks the teacher.
“A boxing referee only counts from 10 to 1,” Jack answers.
1．Jack is not good at ______. ( )| A．PE | B．maths | C．sports |
| A．hard-working | B．lazy | C．brave |
| A．going to school | B．learning maths | C．watching TV |
| A．a boxing referee | B．a teacher | C．an engineer |
| A．he needs to work hard at school | B．no job suits him |
| C．he only needs to count from ten to one to become a boxing referee | |
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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
