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1．Many people like animals and take them as their pets. Nowadays pet hospitals are very busy. Persons who love animals are needed to work in busy animal hospitals.
2．What about a robot for a pet? This may sound silly, but it could become true. Robot dogs have been made to bark like real dogs. These “pets” might become more and more popular in the future. After all, robots don’t lose hair or chew on things the way real pets do.
3．Lots of people miss their pets while they are on holiday. One hotel in Minnesota, USA, has solved this problem. They lend cats to their guests. Many experts believe this idea will become more and more popular. It is very possible that in the future you will be able to order a pet, as well as room service, at a hotel.
| A．Enjoying pets at hotels |
| B．Assistants needed in pet hospitals |
| C．Robots for pets |
| D．Smaller pets |
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
