题目

2020年湘潭市某一天的最高气温为 ℃，最低气温为 ℃，这天湘潭市的温差是 ℃； 答案：【1】8(2013·安徽省芜湖三校一模)A recent study has found that the number of smokers ________ sharply over the past five years.A．is increasingB．are increasingC．has been increasingD．have been increasing