Steel is an alloy composed primarily of iron and carbon.

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问题 Steel is an alloy composed primarily of iron and carbon.

选项 A、traditionally
B、ironically
C、carefully
D、principally

答案D

解析 primarily表示“主要地”,与D项的principally“主要地”表示的含义相同。Traditionally“传统地”;ironically“讽刺地”;carefully“小心地”。
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