单选题：Whatcanweinferfromthelastparagraph?

题目分类：英语六级
题目类型：单选题
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题目内容：

Whatcanweinferfromthelastparagraph? A．Theresearchershaveproducedthegenomepatternsofblack"ship"rats.
B．Thepatternsshowacloserrelationshipwithkoalaretrovirus.
C．TheratsinfectedbykoalaretroviruswereshippedtoAustralia.
D．Theresearchersfailedtouncovertheexactmodeofinter-speciesretroviraltransmission.

参考答案：

答案解析：

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