A. the mouth B. the skin C. the small intestine D. ears
A. brushing teeth or cleaning dentures B. flossing teeth C. the use of mouth water D. the use of fluoride
A. 18~22℃ and 41~46℃ B. 22~24℃ and 41~46℃ C. 18~22℃ and 40~43℃ D. 22~26℃ and 40~45℃
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