When carbon is added to iron in the proper proportions, the result is steel.A、co

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问题 When carbon is added to iron in the proper proportions, the result is steel.

选项 A、container
B、sequence
C、laboratories
D、amounts

答案 D

解析把适当比例的碳加入铁中，就生成了钢铁。A项container “n. 容器”。B项sequence “n. 顺序，次序”。C项laboratories “n. 实验室：实验大楼”。D项amounts “n. 数量，数额”。

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