1.解析：细节理解题。根据“CDC’s recommendations for vaccination(接种疫苗)，which focus on younger people，those with underlying conditions such as asthma and pregnant women”可知CDC建议重点给孕妇等接种疫苗。
答案:B
2.解析：细节理解题。根据第三段首句可知患H1N1流感住院的病人的年龄比患季节性流感住院的人的年龄要小。也就是说，患季节性流感住院的病人的年龄比患H1N1流感住院的人的年龄要大。
答案:A
