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Water is very important to people. We must drink water every day. We can’t live without water. Water is everywhere around us. At home, we use water to wash clothes, to wash dishes, cook meals and so on.
At work, people use water to put out fires, to grow vegetables, to make things in factories and so on. We can also swim in the water.
However, there isn’t much water on the earth. We must save it.
1．Water is not important to people.2．We must drink water every day.
3．People use water to cook meals at work.
4．There isn’t much water on the earth.
5．We shouldn’t waste water.
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
