Based on the above, The main idea of paragraphs 3 and 4 is stated in the first sentence of paragraph 3.
The main idea is known to be the key or central point that is said to be passed by an author to readers.
Note that Main ideas are often seen at the start of any paragraphs and thus, Based on the above, The main idea of paragraphs 3 and 4 is stated in the first sentence of paragraph 3.
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