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Students: Good morning, Mr Rong.
Mr Rong:
Diandian: There are sixty teachers in our school.
Mr Rong: How many students are there in your class?
Huahua:
Mr Rong: Let’s play a counting game.
Students: OK. One, two, three ... twenty-five.
Mr Rong:
| A．Oh, you are so great! |
| B．How many teachers are there in your school? |
| C．Count from 1 to 25. |
| D．I’m your new teacher, Mr Rong. |
| E．There are forty-four students. |
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
