题型分类：否定事实信息题

原文定位：整个段落都在讨论这个内容，可直接通过选项定位。

选项分析：

C选项 The decline of the mosquito population 属于无中生有；

A选项 The most toxic viruses died with their hosts 对应原文 the deadliest strains of the virus perished with their hosts，died 与 perished 属于同义改写，都是死亡的意思；

B选项 surviving rabbits were increasingly immune 对应原文 The virus was less deadly... 选项 increasingly immune 与原文 less and less harm 属于同义改写；

D选项对应 genotypes (the genetic make-up of an organism) in ...，选项 favored 与 selected 属于同义改写。