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Cindy and Anna were best friends. They were always happy together, but one day they couldn’t agree on w 1．to do.
“Come on, let’s play chess, "Anna said.
“I don’t want to play chess,” Cindy replied. “We always do what you want to do, Anna. It’s my turn to make a d2．.” Cindy was getting a little unhappy and went away, leaving Anna alone.
The next day at school, their teacher Mrs. Stone asked for their n 3．Anna looked quite worried because she didn’t find her notebook.
When it was time for lunch, Cindy finally t4．Mrs. Stone she had Anna’s notebook in her schoolbag. “Thank you for being honest, Cindy,” said Mrs. Stone.
Later, Mrs. Stone asked the two girls together and helped them realize that it was a good i5．to take turns to decide the activity. They became best friends again.
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
