問題詳情

54. The brain operation was made possible mainly by _______.
(A) taking the blood out of the brain
(B) trying the operation on monkeys first
(C) having the blood go through a machine
(D) lowering the brain' s temperature

參考答案

答案:D
難度:適中0.5
統計:A(0),B(0),C(0),D(0),E(0)

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