In1964, Yuan Longping discovered a natural hybrid rice plant _______. Since then, he has spent all his life increasing

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1. (2019高一下·荆州期末) In1964, Yuan Longping discovered a natural hybrid rice plant _______. Since then, he has spent all his life increasing the production of rice.

A . at ease B . by chance C . in turn D . on purpose

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湖北省荆州市2018-2019学年高一下学期英语期末考试试卷