When coal, the______of plants, is burnt, chemical energy is changed into heat energy.

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问题 When coal, the______of plants, is burnt, chemical energy is changed into heat energy.

选项 A、remains
B、remainders
C、traces
D、remnants

答案A

解析 remains"残余,遗迹";remainder"剩余物,余数";trace"痕迹,踪迹";rem—nant"余下的部分"。句意为:"当煤——植物的遗体一一燃烧时,化学能使之转换为热能。"
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