53. (27297-!-item-!-188;#058&003151)
Most vaccines are derived from weakened or killed strains of the same virus that they prevent,
unlike the derivation of smallpox vaccine from a different virus altogether.
(A) the derivation of smallpox vaccine from a different virus altogether
(B) smallpox vaccine, which is derived from a different virus altogether
(C) smallpox's vaccine, which gets derived from a different virus altogether
(D) when smallpox vaccine is derived from an altogether different virus
(E) the altogether different virus from which smallpox vaccine is derived 答案是B,没问题 只是句子中的 that they prevent..意思不是很确定。 这里是应该是个限制性定语从句,修饰的是virus. they 指代vaccines 前句表达的意思是大部分的疫苗源于相同的 弱的或者已死病毒。(这些疫苗可以预防病毒)...翻译得太烂了······不知道是不是这样的结构
还有strains of the same virus that A of b that,定于从句是修饰A 还是B 还是AB名词短语啊··?
。。请求讲解下·
|