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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 to wash clothes, to wash dishes, to cook meals, to clean the house, to brush our teeth, to have a bath and so on. At work, people use water to put fires, to grow vegetables, to make things in factories and so on. We can also swim in water. Water is important to us, isn’t it? However (然而), there isn’t much water on the Earth. It is very valuable. We must save it. If we waste too much water, one day in the future, the last drop of water on our planet (行星) will be our tear (眼泪).
1．We can live without water.2．Water is everywhere around us.
3．We can use water to make things in factories.
4．There is too much water on the Earth.
5．The word “valuable” means “普通的” in Chinese.
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
