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With the development (发展) of society (社会), life becomes more and more important. Some people think it is very to do. In fact (实际上), we can do a lot of things .21·cn·jy·com
First, as a , some of us can ride a to school, or walk to school every day. It can energy and it is good our healthy (健康). Second, when we leave the classroom, remember to the lights to save electricity. And third, we should our homework on both sides of the paper. It’s a good to save paper, and to save trees.
If everyone can a low-carbon life, the world will become a better place.
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
