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Fill in the blanks in the following sentences. (a) Coal is one of the ________ used to cook food. (b) When heated in air, coal burns and produces mainly ________ gas. (c) Coal tar is a black, thick ________ with an ________ smell. (d) Petroleum, ________ and ________ are fossil fuels. (e) Forests and coal are ________ natural resources. |
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Answer» (a) fuels (b) carbon dioxide (c) liquid, unpleasant (d) coal, natural gas (e) exhaustible |
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