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15.Under ethical guidelines recently adopted by the NationalInstitutes of Health, human genes are to be manipulated only to correctdiseases for which ____ treatments are unsatisfactory. similar most dangerous uncommon alternative 16.The significance of the Magna Carta lies not in its ____ provisions, but in its broader impact: it made the king subject to the law. specific revolutionary implicit controversial finite 17.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. scarce. . common accessible.. marginal unidentified.. subsidized conserved . . public plentiful.. profitable 18.Although the passage of years has softened the initially hostile reaction to his poetry, even now only a few independent observers ____ his works. praise revile scrutinize criticize neglect 19.Once a duckling has identified a parent, the instinctive bond becomes a powerful ____ for additional learning since, by ____ the parent, the duckling can acquire further information that is not genetically transmitted. | 
