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..."可知答案。
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