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Mrs. Chen took Lingling and Dongdong to a swimming pool for a swim. They changed into their swimwear. Lingling went into the pool and enjoyed the cool water.
Lingling:
Dongdong: No! I’m afraid of water.
Mrs. Chen:
Lingling: I’m also afraid of water before. But you see I’m not afraid now.
Dongdong: But I can’t swim.
Mrs. Chen: It doesn’t matter.
Lingling: Don’t be afraid, Dongdong.
Mrs. Chen: Use the steps to come into the pool, Dongdong.
Dongdong: OK… I’ll have a try.
Mrs. Chen: Hold my hands.
Dongdong:
Mrs. Chen: No thanks. You can’t learn to swim till you jump into the water.
| A．Don’t worry. |
| B．It’s not difficult. |
| C．Thank you, Mrs. Chen. |
| D．Hello, Dongdong. |
| E．Come on, Dongdong! |
| F．I’ll teach you how to swim. |
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
