1. If we stop getting junk mail,
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A. we'll save 250 million trees every year.
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2. If we all lower our heat setting by 2 degrees,
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B. you'll save up to 9 gallons of water each time.
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3. If you use a low-flow shower head（低流量的沐浴器）,
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C. we'll save 500, 000 barrels（桶） of oil every day.
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4. If we all recycle（循环）our newspaper,
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D. we'll save 1.5 million trees every year.
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5. If you turn off the water when brushing your teeth,
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E. you'll save up to 35 gallons of water each time you bathe.
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