单项选择题

According to the passage, high-risk persons exclude which of the following kinds of people

A．Children suffering from asthma.
B．The elderly with chronic pulmonary diseases.
C．Middle aged people with chronic heart diseases.
D．Nurses taking special care of the sick.

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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 Asi