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Pandas are now a symbol of China. Many people around the world l1．pandas, too. Scientists say there are now fewer than 2, 000 pandas living in the forests. Another 300 or so live in 2008 or research centers in China and other countries. Pandas do not have many babies, maybe only one every two years. The babies often d2．from illnesses and do not live very long. Adult pandas s3．more than 12 hours a day eating about 10 kilos of bamboo. Many years a4．, there were a lot more bamboo forests and pandas in China, but then humans started to c5．down these forests. As the forests get smaller and other human activities cause more problems, pandas cannot find enough to eat and they are having fewer babies. Luckily, Chinese government is taking actions to protect pandas.
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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
