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________are inert outside living cells, but within the appropriate cells they ca
________are inert outside living cells, but within the appropriate cells they ca
游客
2023-10-22
73
管理
问题
________are inert outside living cells, but within the appropriate cells they can replicate, causing viral diseases in the organism.
选项
A、Viruses
B、That viruses
C、Viruses, which
D、Despite viruses
答案
A
解析
病毒在活细胞外是惰性的,但在适当的细胞内它们可以复制,从而在生物体内引起病毒性疾病。句子结构理解题。从but可以判断,本句为并列句,空格处所缺的为前一个分句的主语,所以直接填Viruses。故A项为正确答案。
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