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。
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