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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.
C.He’s going to the library.
（3）A.Yes, she does.
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
