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

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单项选择题

By the time new doctors get a job and try to finish their theses in spare time ______.

A．most of them died of some sickness
B．their holidays and evenings have been ruined by their jobs
C．most of them are completely tired of the narrowly defined subject
D．most of their grants run out

单项选择题

Oxford University would be excluded out of those universities that receive PhD grants from ESRC, because the completion rate of its PhD students' theses within four years is lower than ______.

A．25%
B．40%
C．39%
D．10%