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In the future, life will be much 1．. Maybe there will be vision phones（可视电话）in every 2．. People can have a medical examination without a 3． or a nurse in the room and do some shopping without 4． their homes. And what 5． education? There will be 6． educational programs on the radio or on TV. So many children who live in faraway villages don’t need to 7． to school every day. They stay at home. Each family has a robot. Robots will 8． people do their housework. Perhaps some people will fly to the 9． for a holiday and some scientists can live under the 10．.
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
