Trắc nghiệm: In most developed countries. it is not necessary for people to boil water before they drink it,In most developed countries.it is not necessary for people to boil water before they drink it.,In most developed countries. it is not necessary for people to boil water before they drink it.

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In most developed countries. it is not necessary for people to boil water before they drink it, In most developed countries.it is not necessary for people to boil water before they drink it., In most developed countries. it is not necessary for people to boil water before they drink it.

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