Question

why should we avoid standing close to that will close expressions while he is coughing

Answer 1

This is because when a person sneezes , huge amounts of virus are released into the atmosphere from the ting droppers of sneeze.This may be inhaled by a person standing close.
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Answer 2

WE SHOULD AVOID STANDING CLOSE TO THAT WILL CLOSE EXPRESSIONS WHILE HE OR SHE IS COUGHING because as we know that air is a good medium for an bacteria to travel from one organism to another , that is when a person is coughing many harmful bacteria gets released from his mouth which can travel to you , and so you will catch the same disease , that is the reason you will observe your parent and teachers generally ask you to keep a napkin in front of your mouth while you are coughing .

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