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John: Hi, Chen Jie. Look at my new crayons!
Chen Jie:
John: Thank you.
Chen Jie:
John: Guess!
Chen Jie:
John: Open it and see.
Chen Jie: 1, 2, 3…13!
John: That’s right.
Chen Jie: Goodbye.
John:
| A．You have 13 crayons. |
| B．Bye. |
| C．Oh, how nice! |
| D．How many crayons do you have? |
| E．Twelve? |
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
