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（1）A：He’s riding a bike.
B： He rowed a boat.
C：He is swimming.
（2）A： He went fishing.
B： He went to shanghai.
| A．He’s going to the library. |
B： No, she didn’t.
C： No, she can’t.
（4）A: They went by bike.
B：They feel well.
C： They go by bus.
（5）A：Yes, she’s going to go swimming.
B：Yes, she worked at night.
C：Yes, she failed the math test.
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
