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Animals are our friends. But now many animals are in danger because of people’s activities. For example, their living places become smaller because cities develop (发展) and there are more and more people. They don’t have enough (足够的) places to live in or enough food to eat. What’s more, people kill(杀死)the animals for their fur, teeth and meat.
People should protect (保护) the animals, or those animals will disappear forever. People should build some reserves(保护区),so that animals can live freely. And people should not kill the animal sin danger. We should also do something to make the world cleaner. Fresh air, clean water and green grass are all important to animals.
1．Many animals are in danger now.2．Many animals’ living places become bigger.
3．People kill the animals for their fur, teeth and meat.
4．People should eat the meat of the animals in danger.
5．Clean water is not important to animals.
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
