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【简答题】
《快递服务》国家标准于2011年12月30日发布，（）年5月1日实施。
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举一反三
【单选题】The main purpose of the text is to______.
A.
convince the reader that vaccines are not as safe as many think
B.
educate the reader on how vaccines are used and some of their dangers
C.
educate the reader on the circumstances that would neccesitate widespread vaccinations
D.
present the method by which vaccines are used through the case of the smallpox vaccine
【简答题】These vaccines can ________specific responses
【单选题】Which one of the following statements describes an advantage of killed vaccines over attenuated live vaccines ?
A.
killed vaccines induce a broader range of immune responses than do attenuated live vaccines
B.
killed vaccines more closely mimic natural infections than do attenuated live vaccines
C.
killed vaccines pose no risk that vaccine might be transmitted to susceptible contacts
D.
killed vaccines are efficacious against respiratory infections because they induce good mucosal immunity
E.
none of the above is right
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