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Here are seven tips on how to save water, electricity（电）and paper at home. Turn off the lights in your house when you don’ t need them. Turn off your computers and TVs when you are not using them. In cold weather, don’t turn on a heater. Wear warm clothes. Don’t leave the water running while you are brushing your teeth. Turn the tap off. Don’t fill your coffee pot with too much water. Only boil as much water as you need. Take a shorter shower. Stay under the shower for just three minutes. Use both sides of every piece of paper.
1．How to keep warm in cold weather?______________________________________________________________
2．What to do with computers?
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3．What can’t we do while we are brushing our teeth?
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4．How long to stay under the shower?
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5．How to save paper?
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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
