问题描述：
Whensummercomesitwillbecomesohot 61 peoplehardlystandthehotness.Thanks 62theinventionofair-conditionerspeopleneedn’tsufferthehotweatherany 63 (long).Sotheycanstayindoorsandenjoythecoolnessthatair-conditionersbring. 64 theproblemcomes.Whenpeopleuseair-conditionersforalongtimetheirbodieswillbeweaker.Somepeoplefeeldizzyandhaveno 65 (strong)todotheirjobsandotherpeopleareeasy 66 (get)cold.Allofthesearesymptomsofthetypicalillnesswhich 67 (cause)byair-conditioners.Thoughair-conditionersbringuscomfortwe 68 (feel)sickifweuseitallthetime.Soweneedtogooutsideoftenevenit’shot.What’smore 69 (take)exerciseisneeded.The 70 (nature)temperatureissuitableforustoliveinanditismorebeneficialtoourhealth.
