2. 外语
  3. During the period 1490～1979 the main progress mentioned in this passage was ______. The word "scuba" is ______.

During the period 1490～1979 the main progress mentioned in this passage was ______. The word "scuba" is ______.

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问题 During the period 1490～1979 the main progress mentioned in this passage was ______.
The word "scuba" is ______.
选项 A、a certain diver’s name
B、an original English word
C、named by the inventor
D、the first letters of five English words
答案D
解析 由倒数第二段中的The most important advance, however, was the invention of a self-contained underwater breathing apparatus, which is called a "scuba"可知，scuba为self-contained underwater breathing apparatus五个单词首字母的缩写，意为"水肺"，即"水下呼吸器"。
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