prep07 53 普通的名词做定语和所有格定语

Etoile-

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

Etoile-

自顶一下，求个大佬来回答一下

gongxiaorong

这两个的区别就是哪个更优，一般都说rabies vaccine，flu vaccine的，没有加'的，同时be动词的系表结构也比get这个强。