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Mr. Smith was blind when he was seven. He had seen many doctors but none of them could do anything for him. He could never see the world again. Now he has a seeing-eye dog. A seeing-eye dog can help a blind man walk along the streets. It’s very useful for his live.
[[QOrDeR]]Mr. Smith was blind when he was six. （【小题2】He could never see the world again. （
【小题3】He hadn’t seen doctors. （
【小题4】A seeing-eye dog can help him walk along the streets. （
【小题5】A seeing-eye dog is very useful. （
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
