73．The underlined word "spin-offs" in Paragraph 4 probably refers to______．
(A)survival chances
(B)potential resources
(C)unexpected benefits
(D)physical possessions

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#1202413
词义猜测题。选C。根据spin off 前面的we have already benefited from other spin off 关键词 benefit，受益。而spin off后面的including … 说的全是获得的利益，如improvements in earthquake prediction. 地震预测的进步等等，而不是什么生存机会，或者潜在资源。所以选C。
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