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 由第二段中的The plan did not work, but...可知这个计划没有实施，但却为后来的发明者提供了一种思路。
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