搜索
| A．Would you like to help us? |
| B．It’s done! |
| C．Are you ready for it? |
| D．The star always goes on top! |
Danny: Yes. What are you doing now?
Jenny: We are putting up the Christmas trees.2
Danny: Yes, I’d like to.
Jenny: Can you put the star on the tree.
Danny: Yes.3.
Jenny: Then let’s put the gift under the tree.
Danny: There!4.
Jenny: It’s beautiful!
1.________ 2.________ 3.________ 4.________
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
