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| A. It's eating a banana. B. What is it doing? C. Yes, it's in the tree. D. They're swimming. E. She is looking at the baby dog. |
Lucy: Look, Lingling. There is a baby dog. It's lovely.
Lingling:
Lucy: It's sleeping.
Lingling: That is the mother dog.
Lucy: What is she doing?
Lingling:
Lucy: Yes,
and I can see a monkey. Can you see it?
Lingling:
Lucy: What is it doing?
Lingling:
Lucy: Look! There are many fish in the river. What are they doing?
Lingling:
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
