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sveta [45]
3 years ago
15

________ of secondhand smoke can be harmful.

Health
1 answer:
Murrr4er [49]3 years ago
7 0
Well really, it could not be both A and B, as option B contains the world 'Only' which means it can not (depending on the context) be put with other options, so that rules D out, low levels of second hand smoke can still be harmful, it is even listed on the National Cancer Institute 
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