While they remove carbon dioxide from the air, conserve soil and water, and house thousands of species, forests also supply potentially valuable pharmaceuticals, and, as sources of building material and firewood, that provide employment for millions worldwide.
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Apharmaceuticals, and, as sources of building material and firewood, that provide
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Bpharmaceuticals, and sources of building material and firewood, are providers of
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Cpharmaceuticals and, as sources of building material and firewood that are providing
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Dpharmaceuticals and sources of building material and firewood, for providing
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Epharmaceuticals and, as sources of building material and firewood, provide
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正确答案: E