搜索
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, to cook meals(餐), to clean our teeth and so on(等等). At work, people use water to put out fires(灭火), to grow vegetables(种菜), to make things in factories(工厂) and so on. Water is important to us, isn’t it? However(可是), there isn’t much water on the earth. It is very valuable(珍贵的). We must save it. If we waste too much water, one day in the future, the last drop(滴) of water on the earth will be our tear(眼泪).
1．We can live without water.（______）
2．Water is everywhere around us.（______）
3．We can’t use water to make things in factories.（______）
4．There is too much water on the earth.（______）
5．Water isn’t important to people.（______）
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
