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Mary is an American schoolgirl. She is now in Hangzhou with his parents. Mary d1． know Chinese, but she is trying to learn and speak Chinese She often tries to speak Chinese to her Chinese friends. Sometimes they don’t understand（理解）her, because she can’t speak Chinese w2．.
It was Sunday morning. She went out. She was going to the z3． to see the elephants and monkeys, but she didn’t know h4． to get there. She asked a Chinese schoolgirl, but the girl e couldn’t understand her. Then she took out a pen and some paper. She d5． an elephant on it, and showed the picture to the girl. The girl smiled and then showed Mary the way.
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
