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  3. The passage implies that the telegraph cable was built mainly ______. This passage is mainly about ______.

The passage implies that the telegraph cable was built mainly ______. This passage is mainly about ______.

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问题 The passage implies that the telegraph cable was built mainly ______.
This passage is mainly about ______.
选项 A、the beginning of oceanography
B、the laying of the first undersea cable
C、the investigation of ocean depths
D、the early intercontinental communications
答案A
解析 主旨概括题。文章先对海洋学做出解释；然后指出19世纪以前对海洋感兴趣的科学家极少；接下来谈到首条欧美海底电缆铺设时，人们才对海洋问题产生兴趣；最后提到之后几年中海洋学得到初步发展。
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