搜索
Look at the blue Earth. This is our home. There are plains (平原), mountains, rivers, lakes and oceans (海洋) on our planet (行星). There are many kinds of trees, flowers sand grass on our earth. There are many kinds of wild (野生) animals living together with us. But sometimes we do bad things to it. We waste too much water. We cut down too many trees. We hunt (捕猎) too many wild animals for food or clothes. We waste too much energy. Too many cars use a lot of energy. We use too many plastic bags. We shouldn’t do these things. We should save our Earth, because we have only one Earth.
1．There are no plains and oceans on Earth.2．There are many kinds of wild animals on Earth.
3．We sometimes do bad things to the Earth.
4．We hunt wild animals just (只，仅仅) for food.
5．We should save our Earth because we have only one 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
