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Working Dogs
Many people keep dogs as their pets.
Some people need their dogs to help them. Many blind(盲人) people have pet dogs. Dogs help them walk. They help blind people cross the street. They are the eyes of them. These dogs are trained(接受训练) for months. Then they live with a blind person. Their job is very important.
Many deaf(耳聋) people have dogs, too. Dogs help them hear.
Do you have a dog at home? Is it helpful, too?
1．Many people keep dogs as their2．Dogs can help blind people
3．These dogs are trained for
4．Dogs can help deaf people
5．Working dogs’ job is
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
