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There is a TV show about dogs. Dogs are very useful. They can do a lot. This blind man can't see. The dogs can help him. This girl is deaf. She can't hear. The dogs can help her. The dogs can help the firefighters, too. Do you want to have a dog? You can have a pet dog. It can play with you.
( ) 1.The dogs aren't very useful.
( ) 2.The dogs can help the blind people.
( ) 3.The dogs can help the deaf people.
( ) 4.The dogs can't help the firefighters.
( ) 5.The passage (文章) is about flowers.
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
