In 1490 or so, the main progress mentioned in this passage was______. The word "scuba" is______.

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问题 In 1490 or so, 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
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