Plants and animals need each other to keep the air ‘right’ for all of us in the world. Plants are 36 made of carbon. They make their own food 37 using carbon dioxide from the air and water from the earth. They take in water
through 38 and carbon dioxide through their leaves. They use the carbon from the carbon dioxide to build new leaves, stems, and flowers, 39 they don’t need the oxygen from the water or from the carbon dioxide. When it is dark, plants 40 a lot of oxygen, and so there is new oxygen in the air for us to breathe.
【題組】38 (A) their roots (B) the air (C) oxygen (D) the sun
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