It might be dangerous because everyone breathes the same air. Peoples body’s can be weaker to others and could get sick if no fresh air is coming threw the class.
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Answer:
A. Dictionary
Although the rest of the options are also good sources, physical or electronic dictionaries are nowadays the most helpful and complete sources in finding concrete or specific information regarding a word's meaning, equivalence, use, and origin.
Some of the most common online dictionaries are Merriam-Webster, Britannica, Macmillan Dictionary or Collins English Dictionary.
Explanation:
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