1. 不可预见性：本文重点描述的不是蝗虫集结成群带来的后果(plague),因此,A被排除. 蝗虫的再繁殖(reproduction)与蝗虫灾害的不可预见性(unpredictability)只是作者所涉及到的两个细节,显然不能作为该短文的主题. 本文作者着重描述了蝗灾的形成过程,
2. 予測不可能性：unilateral network ==> 単方向性回路網 | unpredictability ==> 予測不可能性 | unsaturated cell ==> 不飽和電池
noun
1. the quality of being guided by sudden unpredictable impulses
Synonym: capriciousness
2. lacking predictability
3. the trait of being unpredictably irresolute
e.g. the volatility of the market drove many investors away
Synonym: volatility