Viruses that are inert outside living cells, but within the appropriate cells th

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问题 Viruses that are inert outside living cells, but within the appropriate cells they can replicate, causing viral diseases in the organism.

选项 A、Viruses
B、Viruses of which
C、Viruses, which
D、Despite viruses

答案 A

解析句子主干为viruses are inert outside living cells，but they can replicate，句子中的causing…作结果状语。句意：病毒在活细胞外是惰性的，但在相应的细胞内可以复制，引起机体的病毒性疾病。

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