Most vaccines are derived fromweakened or killed strains of the same virus that they prevent, unlike thederivation of smallpox vaccine from a different virus altogether.
(A) the derivation of smallpoxvaccine from a different virus altogether
(B) smallpox vaccine, which isderived from a different virus altogether
(C) smallpox's vaccine, which getsderived from a different virus altogether
(D) when smallpox vaccine is derivedfrom an altogether different virus
(E) the altogether different virusfrom which smallpox vaccine is derived
想请教各位大佬smallpox vaccine， smallpox's vaccine两者到底怎么区别啊 网上看了好久还是没看懂 这道题的答案是B
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发表于 2017-9-25 15:40:37
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