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Lingling:
Dongdong: It’s Tree Planting Day tomorrow.
Lingling: Plant trees? Where shall we plant trees?
Dongdong:
Lingling: Why do people plant trees?
Dongdong: Because trees can keep the air clean.
Lingling: Great! Planting trees is really good for us.
Dongdong: Yes!
Lingling: Let’s ask Anne and Peter to go with us.
Dongdong: Good idea. Then after planting trees, we can take a walk around the park.
| A．We can go to the park. |
| B．Trees can keep us cool. |
| C．What can we do? |
| D．Hello, Dongdong. |
| E．So we should plant more trees. |
| F．Shall we go to plant trees? |
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
