The introductory part of a speech or writing brings in the main ideas that will be further explained in the text. Paragraph 1 of the above passage adds to the development of the text mainly by;
A connection is created between our present world and those of the ancient and classical worlds in the first paragraph.
The author begins by saying that there is not much difference between these worlds.
That means that they bear similarities. He goes on to provide examples of things that are similar between our world and theirs.
Therefore, Sentence A shows the aim of the first paragraph.
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