题目内容
（请给出正确答案）
提问人：网友w*****2
发布时间：2022年3月23日 22:32
[单项选择题]
The railroad industry could not have grown as large as it did without steel. The first rails were ma...According to the passage, the railroad industry preferred steel to iron because steel was ______.
A．cheaper and more plentiful
B．lighter, and easier to mold
C．cleaner, and easier to mine
D．stronger and more durable
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