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Tigers are beautiful animals. They are important to the1．. But they are2．now. It is hard to believe that there are only about one3． South China tigers left in the world-and few live in the wild. Why is the situation4． serious? Some people have caught and killed tigers5． money. Some people have6． a lot of trees. What should we do to protect the tigers? People need to think about these questions7．.
To make it easier for the tigers to live, we should protect their home in the wild, and build8．natural places for them. We should also work hard to stop people from9．tigers. If we can do these things well, there will be more tigers10．. Let's start now!
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
