2. 外语
  3. During the period 1490—1979 the main progress mentioned in this passage was______. An invention of an Italian professor______.

During the period 1490—1979 the main progress mentioned in this passage was______. An invention of an Italian professor______.

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问题 During the period 1490—1979 the main progress mentioned in this passage was______.
An invention of an Italian professor______.
选项 A、gave later inventors the idea of moving air around in diving devices.
B、can "clean" the air.
C、was used to remove moisture.
D、was nothing but a plan.
答案D
解析
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