【单选题】In 1957, a doctor inSingaporenoticed that hospitals were treating an unusual number of influenza-like cases. Influenza is sometimes called “flu” or a “bad cold”. He took samples from the throats of pa...
A.
To test the speed and effect of virus reproduction.
【简答题】In 1979, a doctor in Singapore noticed that hospitals were treating an unusual number of influenza cases. Influenza is sometimes called “ flu ” or a “ bad cold ” . He took samples from the throats of ...