1. 我们应该节约能源。
We _________ _________ energy.
2. 他们经常使用木头制作课桌椅。
They _______ ________ wood to ________ desks and _________.
3. 她每天使用筷子吃早饭。
She ________ chopsticks ______ have _________ _________ day.
4. 你应该使用纸袋和玻璃瓶。
You _________ use _________ bags and _________ bottles.
5. 我们不应该砍伐太多的树木。
We _________ cut _________ _________ many 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