2. 考研
  3. Steel is an alloy composed ______of iron and carbon.

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主要地；traditionally传统上地；carefully小心地，谨慎地；partially部分地。该句的意思是“钢铁主要是由铁和碳构成的一种合金”，故答案为A。
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