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( ) 1.A. The boy can't hear. His dog helps him.
B. The boy can't swim. His father helps him.
( ) 2.A. Miss Li can help her.
B. Mr Li can help her.
( ) 3.A. The boy can't ride a bike. I can help him.
B. The little boy can't fly a kite. I can help him.
( ) 4.A. The firefighters can't find the people.
The cat can help them.
B. The firefighters can't find the people.
The dog can help them.
( ) 5.A. I can help my mother clean the window.
B. I can help my mother wash clothes.
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
