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Jenny invited Danny to go swimming .When Danny walks to the swimming pool .Jenny is already in the pool. Jenny swims towards Danny. She swims very fast! " Jump in !"she says. "I can't" says Danny ."The water is too cold." " No, it's not! "says Jenny ."It's warm! Jump in !""I can't." says Danny. " Why?" asks Jenny. "Because I'm scared !I can't swim!" says Danny.
1．Jenny and Danny don't like swimming. （2．Jenny is good at swimming. （
3．Danny jumps into the water at last. （
4．The water is too cold ! （
5．Danny can't swim. （
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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
