What is the best title for the passage? Why does the author mention a steamship?

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问题 What is the best title for the passage?
Why does the author mention a steamship?

选项 A、To illustrate that man can make use of sources of energy from the sea.
B、To show that a steamship is better than other kinds of ships.
C、To argue that man should use steamships.
D、To indicate that it is warmer in the ocean than on land.

答案A

解析 作者在文章中提到蒸汽船,就是为了说明人类可以利用很多种海洋资源。文章第四段说,除了石油和天然气,海洋还提供了很多新能源,接着就以蒸汽船为例证明这一点。
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