A、Babies. B、Old men. C、Young men. D、Doctors. B注意听清楚本题问的是没那么必要注射疫苗的人(less necessary)。新闻中指出，美国政府小组委员会认为孕妇、医护工作者、孩子和24岁以下的年轻人都应该优先注

An American government panel has recommended that pregnant women, health-care workers, children and young adults up to the age of 24 should get priority for the flu vaccine released later this year. But the Advisory Committee on Immunization Practices conceded the policy may change if not enough vaccine is produced by October. Doctor Ann Schuchat of the Center for Disease Control said it is vital for pregnant women who have breathing illness and fever to get early treatment. "We think some suitable medicines for them can be lifesaving, and that’s a very important message. We also think it is important, for them to get seasonal influenza vaccine, and today the committee recommended that when vaccine is available, and we have a decision to go forward that the pregnant women really should consider getting the H1N1 vaccine".
    3. Who are less necessary to receive the flu vaccinations?  
    4. Why do pregnant women enjoy the top priority to get vaccine?