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Paragraf Tamamlama 121. Soru

Bu Testin Birincisi Bengu

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121.

Some of the best discoveries are accidental. Until the 18405, for example, rubber was not a very useful material because it was too stiff in cold weather and too soft in hot weather. An American named Charles Goodyear tried to solve this problem by mixing rubber and sulphur, but the experiment failed. ……… . Though he patented the process, which we know today as "vulcanised rubber", it was so simple that many others copied it.

One day, he spilt his mixture on a hot stove, and this gave him just the substance he was alter

Since he could not create the .substance he wanted, he went bankrupt and died penniless

Today he is remembered because of the tyres that bear his name

Natural rubber comes from the sap of a tree that has been very carefully cut

Then he had an accident and burned himself so badly that he had to stop his search for a long time