题目信息
Just as Edward Jenner used the pustules from milkmaids to inoculate against smallpox, effectively removing the specter of death that had hung over the population, the smallpox vaccine today is derived from a live virus, which immunologists have obtained from the pustules of infected organisms.
A:the smallpox vaccine today is derived from a live virus, which immunologists have obtained from the pustules of infected organisms
B:so too do today`s immunologists in deriving the smallpox vaccine of a live virus, which has been obtained from the pustules of infected organisms
C:the modern smallpox vaccine itself is derived from a live virus that immunologists have obtained, coming from the pustules of infected organisms
D:so immunologists today use the pustules of infected organisms to obtain a live virus from which the modern smallpox vaccine is derived
E:so modern immunologists have obtained the live virus in the pustules of infected organisms, from which the smallpox vaccine is derived
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D:so immunologists today use the pustules of infected organisms to obtain a live virus from which the modern smallpox vaccine is derived
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