A critical factor that plays a part in susceptibility to colds is age. A study done by the University of Michigan School of Public Health revealed particulars that seem to hold true for the general population. Infants are the most cold ridden group, averaging more than six colds in their first years. Boys have more colds than girls up to age three. After the age of three, girls are more susceptible than boys, and teenage girls average three colds a year to boys two. The general incidence of colds continues to decline into maturity. Elderly people who are in good health have as few as one or two colds annually. One exception is found among people in their twenties, especially women, who show a rise in cold infections, because people in this age group are most likely to have young children. Adults who delay having children until their thirties and forties experience the same sudden increase in cold infections. The study also found that economics plays an important role. As income increases, the frequency at which colds are reported in the family decreases. Families with the lowest income suffer about a third more colds than families at the upper end. Lower income generally forces people to live in more cramped quarters than those typically occupied by wealthier people, and crowding increases the opportunities for the cold virus to travel from person to person. Low income may also adversely influence diet. The degree to which poor nutrition affects susceptibility to colds is not yet clearly established, but an inadequate diet is suspected of lowering resistance generally.
【三维设计】2017届高考英语(江苏专用)二轮复习写作增分锦囊课件:6 书面表达常见错误及对策
2017届高考英语二轮复习大题冲关秘籍语法填空:创新押题(含解析)
【三维设计】2017版(江苏专用)二轮复习练习:选修8 Unit 4《Films and film events》单元检测(含解析)
【三维设计】2017届高考英语(江苏专用)二轮复习阅读理解解题技法示范课件:1
体坛英语资讯:Chinese shuttler Tian ejects Denmarks Jorgensen in Dubai World Superseries semis
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块6 Unit 1《Laughter is good for you》
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块8 Unit 3《The world of colours and light》
【三维设计】2017届高考英语(江苏专用)二轮复习阅读理解解题技法示范课件:3
【三维设计】2017届高考英语(江苏专用)二轮复习阅读理解解题技法示范课件:2
俄土表示:俄大使遇刺不会妨碍两国关系
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块7 unit 2《Fit for life》
【三维设计】2017版(江苏专用)二轮复习练习:选修8 Unit 2《The universal language》课时跟踪检测B卷(含解析)
国内英语资讯:Xinhua Insight: China combats heavy smog with red alerts
Bus for homeless, urban bees 流浪者入住公共汽车、蜜蜂的城市庇护所
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块7 unit 1《Living with technology》
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块7 unit 4《Public transport》
投资移民性价比最高的欧洲国家
国内英语资讯:Chinese premier sends condolences to German chancellor over Berlin terror attack
Light pollution dampens urban robins' song 城市光污染抑制知更鸟的鸣唱
川普:欧洲恐袭证实他筛选甄别穆斯林计划正确
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块8 Unit 2《The universal language》
【三维设计】2017届高考英语(江苏专用)二轮复习阅读理解解题技法示范课件:6
【三维设计】2017版(江苏专用)二轮复习练习:选修8 Unit 3《The world of colours and light》课时跟踪检测B卷(含解析)
2016年度十大资讯热词
2017届江苏省淮安市新马中学高考牛津译林版英语一轮复习活动单:模块6 Unit 3《Understanding each other》
最新研究发现 睡眠不足会对心脏有所影响
美文赏析:坚强,有时是迫不得已
【三维设计】2017版(江苏专用)二轮复习练习:选修8 Unit 2《The universal language》单元检测(含解析)
【三维设计】2017版(江苏专用)二轮复习练习:选修8 Unit 3《The world of colours and light》课时跟踪检测A卷(含解析)
国内英语资讯:Xi stresses clean energy use to reduce smoggy days
不限 |
英语教案 |
英语课件 |
英语试题 |
不限 |
不限 |
上册 |
下册 |
不限 |