(Due to ) presistent inbreeding, self-pollinating plants (have) genetically more uniform than cross-pollinated plants, which harbor more genetic (variability).
上广州XDF的时候听lili老师说这道题是“。。。。。无数个热血青年葬身的墓地”,但是在这之前对题目的讲解我正好走神了,现在再看回这道题,好郁闷,希望GGJJ能进来讨论一下,谢谢!~
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