2. 外语
  3. In 1490 or so, the main progress mentioned in this passage was ______. An invention of an Italian professor ______.

In 1490 or so, the main progress mentioned in this passage was ______. An invention of an Italian professor ______.

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问题 In 1490 or so, 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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