单项选择题

Year after year a dedicated Swedish chemist worked to find a substance which, when (1) nitroglyoerine (硝化甘油), would make explosives safer to handle (2) weakening their force. He had a personal (3) scientific reason to pursue his search, because his (4) brother had been killed when a can of nitroglycerine (5) exploded. The oily liquid had been (6) for so many disasters that its (7) had finally been outlawed by many countries.
While (8) a new formula one morning, the doctor broke a test tube and gashed (划开) his finger. He was daubing (涂搽) the (9) with collodion (火棉胶), a coating solution of gun -cotton dissolved in ether- alcohol (乙醚), (10) the idea struck him - mix collodion with the nitroglycerine! (11) . was the answer. The new mixture, (12) blasting gelatine (爆胶), was not only (13) safe to handle as dynamite, but it was also one - and - a - half times more powerful! In fact, so powerful (14) that it paved the way for a whole new (15) in construction and engineering. Mines were (16) , roads were built, and canals were cut at a speed once (17) impossible. It had another use, also - death and destruction in warfare. Its inventor had believed that the power of his new (18) would so awe the military mind that it would actually be a deterrent to war. (19) it became a weapon that brought death to millions of soldiers and (20) .

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