18．A.thing B．situation

　　C．fact D．tool

　　19．A.sufferingB．doing

　　C．learning D．knowing

　　20．A.concern about B．take care of

　　C．break away from

　　D．get rid of

　　.阅读理解

　　(2017·江西高安中学模拟)

　　Mouth bacteria grow fast in airless conditions.Oxygen rich saliva (唾液) keeps their numbers down.When we sleep，for example，the saliva stream slows，and sulfur (硫) producing bacteria gains the upper hand，producing classic “morning breath”．

　　Alcohol drinking，too much talking，breathing through the mouth during exercise，anything that dries the mouth produces bad breath.So can stress，though it’s not understood why.Some people’s breath turns sour every time they go on a job interview.

　　Saliva flow gradually slows with age，which explains why the elderly have more bad breath trouble than younger people do.Babies.however，who make plenty of saliva and whose mouths contain relatively few bacteria have characteristically sweet breath.

　　For most of us，the simple，dry mouth variety of bad breath is easily cured.Eating or drinking starts saliva and sweeps away many of the bacteria.Breakfast often stops morning breath.

　　Those with constant dry mouth find that it helps to keep gum，hard candy，or a bottle of water or juice around.Brushing the teeth wipes out dry mouth bad breath because it clears away many of the offending bacteria.

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