搜索
Amy: Happy birthday, Sam!
Sam: 1．
Amy: Here’s your present.
Sam: Oh. 2．
Amy: Guess(猜一猜).
Sam: 3．
Amy: 4．
Sam: Is it a pen?
Amy: 5．
Sam: Oh, it’s beautiful(漂亮的)! Thank you again.
| A．No, it isn’t. |
| B．Is it a pencil? |
| C．Thank you. |
| D．What’s this? |
| E．Yes. It’s a red pen. |
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
