Steel is an alloy composed______of iron and carbon.

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问题 Steel is an alloy composed______of iron and carbon.

选项 A、primarily
B、traditionally
C、carefully
D、partially

答案A

解析 primarily意为"主要地,基本地",本句意为"钢铁主要是由铁和碳合成的一种合金"。tradition ally意为"传统地";carefully意为"小心地,认真地";partially意为"部分地"。
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