单选题：Generationslater,whatwillhappentoKoalaretroviru?

题目分类：英语六级
题目类型：单选题
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题目内容：

Generationslater,whatwillhappentoKoalaretroviru? A．Itwillbecomemoreharmful.
B．ItwillbecomepartofKoala'sgenome.
C．Itwillcausecancer.
D．Itwillcauseimmune-systemproblems.

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