0 The word 'testing' suggests the general activity of 'doing various tests'. With respect to the indefinite article, nuclear testing suggests multiple tests, so the word 'a' would not be not appropriate:02br 02br 00- 01i 00nuclear testing 02i 00vs01i 00 01b 00a02b 00 nuclear 01b 00test02b 00 02i 02br 00With respect the the definite article, the use of the word 'the' would refer back to an already mentioned or specific group of nuclear tests. For example:02br 00- 01i 00Nuclear testing was done throughout the 1900s.
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