GRE Reading Comprehension: ETS-GRE阅读ETS - YM41U4D6974F75Z67

It can be inferred from the passage that wilt disease virions depend for their survival on A. protein synthesized from the tissues of a host caterpillar B. aspen leaves with high concentrations of phenols C. tannin-rich oak leaves D. nutrients that they synthesize from gypsy moth egg clusters E. a rising threshold of caterpillar vulnerability to wilt disease