During the period 1490~1979 the main progress mentioned in this passage was ______. The German, Augustus Siebe, invented the "h

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问题 During the period 1490~1979 the main progress mentioned in this passage was ______.
The German, Augustus Siebe, invented the "hard-hat suit" which was used ______.

选项 A、for nearly a hundred years
B、for almost a thousand years
C、for over a century
D、for a century or so

答案A

解析 由第三段中的Finally, in l837, he invented the ’hard-hat suit’ which was to be used for nearly a century可知正确选项。
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