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Why are people of different colours? People were born in different areas. They have different skin colours. All skin colours come from melanin. Some people were born in a hot and sunny place. They develop more melanin. Melanin can protect our skin from the sun. People with more melanin are darker and those with less are lighter. Dark skin can help protect against the sun and skin cancer.
1．Light skin can help protect against the sun and skin cancer.2．People around the world have the same skin colour.
3．If you were born in a hot and sunny place, you would have lighter skin.
4．Melanin can’t protect our skin from the sun.
5．Light-skinned people have less melanin than dark-skinned 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
