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Scientists have devised several techniques for improving crop plants; recombinant genetic technology is just the latest and most (i)________ of them. By contrast, another (ii)________ method—bombarding seeds with radiation in the hope of producing (iii)________ mutations—prompted no questions about the safety of the countless crops it produced.
- Blank(i)
- unnatural
- ambiguous
- controversial
- Blank(ii)
- heretofore common
- hotly contested
- tentatively proposed
- Blank(iii)
- advantageous
- inexpedient
- virulent
controversial , heretofore common , advantageous 显示答案
以上解析由 考满分老师提供。
