One impact that the burning of ______ fuels has had on the Earth’s environment h

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问题 One impact that the burning of ______ fuels has had on the Earth’s environment has been the increase of carbon dioxide in the earth’s atmosphere.

选项 A、vehicle
B、oil
C、gas
D、fossil

答案 D

解析固定搭配fossil 化石；但fossil fuels 是固定用法，表示：(煤、石油、天然气等)矿物燃料；本句意为：(煤、石油、天然气等)矿物燃料的燃烧对地球环境的一个影响就是加大了地球大气层中二氧化碳的含量。因此D为答案。

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