Chinese scientists have made a great__in genetics in the past ten yearsA.principle B.breakthrough C.conclusion D.introduction

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Chinese scientists have made a great__in genetics in the past ten years
A.principle B.breakthrough C.conclusion D.introduction

B

B
中国科学家在过去十年内在基因学上取得了重大(突破)。
A=原则
C=结论
D=介绍
都不适合。

B. Breakthrough
Chinese scientists have made a great breakthrough in genetics in the past ten years.

选B