2015拉萨市
高考英语阅读理解、书面表达自练(7)答案(三月)
阅读理解。
《2014•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 “m