問題詳情

18. Efforts at decoding the DNA sequences of the chromosome have pushed back the frontiers of genetic research. But havewe stepped onto the formerly unknown area of knowledge at our own great risks?
(A) broken down the barriers
(B) narrowed down the scope
(C) broaden the range
(D) set definite limits
(E) ventured into the dangers

參考答案

答案:C
難度:非常困難0.153846
統計:A(2),B(2),C(2),D(1),E(5)

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