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Last week, Mrs. Millie went to London. She does not know London very well, and she lost her way. Suddenly, she saw a man near a bus stop. "I can ask him the way," she said to herself, "Excuse me," she said. "Can you tell me the way to King Street, please?" The man smiled pleasantly. He didn't understand English! He was a tourist. Then he put his hand into his pocket (口袋), and took out a phrasebook. He opened the book and found a phrase. He read the phrase slowly. "I am sorry," he said. "I do not speak English."
1．Mrs. Millie went to London last week. （2．Mrs. Millie asked a man the way to a bus stop. （
3．The man was a tourist. （
4．The man knew English well. （
5．The phrasebook was in the hand of the man. （
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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
