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