黄皮书P111页,第2题Because many of the minerals found on the ocean floor are still _____ on land, where mining is relatively inexpensive, mining the ocean floor has yet to become a _____ enterprise.
(A) scarce...common
(B) accessible...marginal
(C) unidentified...subsidized
(D) conserved...public
(E) plentiful...profitable
答案是E。既然on land有丰富的minerals,而且在land上开采相对便宜,为啥去ocean floor开采变成有利可图的了?
楼主解题思路的瓶颈在于对have yet to的错误理解。have yet to 的英文释义是:
Have yet to is defined as an activity, task, event or circumstance which has not occurred or which has not been done.也就是说have yet to在本句里可以理解为have not to,所以应该选E,第二空为profitable.