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¡¡¡¡ËÄ: for, on, Who , think, are, inwentions, is , most

¡¡¡¡Self Check and Reading

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¡¡¡¡¶þ: 1.helpful 2.invention 3.salt 4.the most popular 5.safety 6.wood

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¡¡¡¡ËÄ: 1~5:BADBA 6~10:CADAB

¡¡¡¡Îå: 1~5:ABCAC

¡¡¡¡6.He grew vegetables in his garden and sold them.With the money he set up a chemical lab.

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¡¡¡¡14. 1876~1877,invented the phonograph.

¡¡¡¡15.1900~1910, invented and perfected and steel alkaline storage battery.

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¡¡¡¡Section A

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