13．Winter is the time of year when people feel very blessed．This isn't becau se people feel thankful for the cold weather，nor because the important festivals---Christmas or Spring Festival---offer an excuse to celebrate．In fact，"Bless you!"is a common response if someone sneezes，a symptom（症状）of catching a cold or the flu．
Colds and the flu are the most common illnesses of autumn and winter as the weather gets colder．Viruses cause them．If you get one you will feel annoyed，but it is not usually serious．The flu is spread from person to person when we come into contact with a person with the virus．We get the virus on our hands and then we touch our noses and our mouths．We can pass on the flu before we realize we have it．You can infect（传染） others one day before symptoms develop and for up to five days after becoming sick．
Getting a flu vaccination is the best way to prevent the illness．Even if your body has built up antibodies（抗体）for one kind of flu．The vaccine（疫苗）is only effective for one year and viruses are different from year to year，so it is necessary to get a flu vaccination every year．The best time to get the vaccination is October or November．Besides，there are other ways to reduce your chance of getting a flu．Wash your hands．Get enough rest．Eat garlic regularly．Don't let stress control you．Exercise regularly．
29．We say"Bless you!"whenB．
A．we feel annoyed at someone．
B．someone sneezes．
C．someone catches a cold or the flu．
D．we celebrate some important festivals．
30．The passage is intended to tell usD．
A．how to keep healthy．
B．the causes of flu．
C．the influence of flu．
D．what to do about flu．
31．We can infer the passage thatD．
A．People catch a cold or the flu only in autumn or winter．
B．people getting a flu vaccination won't catch the illness for life．
C．flu can cause symptoms such as sore throat and a runny nose．
D．people with the virus of flu but having no symptoms can still infect（传染） others．
分析 本文是一篇说明文．文章主要讲述了流感是如何产生的，并且如何防治流感．
解答 29． B 细节理解题．从文章第一段末句In fact，"Bless you!"is a common response if someone sneezes，a symptom（症状）of catching a cold or the flu．可知当有人打喷嚏的时候，我们会说"Bless you!"．故选B．
30． D 主旨大意题．文章大意：本文是一篇说明文．文章主要讲述了流感是如何产生的，并且如何防治流感．其它选择项太片面．故选D．
31． D 推理判断题．根据文章第二段末句You can infect（传染） others one day before symptoms develop and for up to five days after becoming sick．可知，在出现感冒症状之前一天就可以传播．故选D．
点评 本文是一个新闻报道类阅读理解，题目涉及多道细节理解题，做题时结合原文和题目有针对性的找出相关语句进行仔细分析，结合选项选出正确答案．推理判断题也是要在抓住关键句子的基础上合理的分析才能得出正确答案，切忌胡乱猜测，一定要做到有理有据．
