【129】評論

48.How did the author explain the idea of “accidental invention”?     作者如何解釋"意外發明"的概念？(A)By giving a definition.   下定義(B)By presenting contrasts.  反面解釋(C)By providing examples.  提供例子(D)By describing its origins.  描述它的起源“Accidental inventions” have been happening for a long time.（舉例子） In 1839, a salesman was experimenting with a newproduct from Brazil called rubber. It could be used to make erasers, but it melted at high temperatures, and broke whenit was cold. The inventor tried mixing it with different chemicals, but nothing worked until he acci...