单项选择题

In which of the following publications would this passage most likely be printed

A．A surgery book.
B．A psychology book.
C．An epidemiologist book.
D．An obstetrics book.
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单项选择题
That a different component part of the vaccine is necessary is principally due to the variable change of ______.
A．virus
B．strain
C．antigen
D．immunization
单项选择题
Which has been done by World Health Organization in combating the bad effects of influenza
A．Supervising the assessment of influenza virus strains.
B．Holding meetings twice a year to provide the latest data concerning the composition of the vaccines.
C．Publishing the related information in a WHO almanac.
D．Stressing the importance of preventing influenza for people living in tropical areas of Asia.
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