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Water is very important to people. We must drink water every day. We can’t live without (没有) water. Water is everywhere around us. At home, we use water to wash clothes and the dishes, to cook meals, to clean the cars, to water flowers, to make drinks, to have a bath 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 on the earth. Water is important to us, isn’t it? However, there isn’t much fresh water (淡水) on the earth. It’s very valuable (有价值的), so we must save it.
1．We can live without water.2．We use water to clean the cars and water flowers.
3．Water is everywhere around us.
4．We should save water and we can’t waste it.
5．There is much fresh water on the earth.
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
