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发布时间：2006-06-22 13:31     点击：

　　(B) The production of copper from other metals in industrial quantities would be prohibitively expensive in energy and materials.

　　(C) Synthetic materials have been discovered that can serve as practical substitutes for copper in most of its uses.

　　(D) It will be impractical, in the foreseeable future, to mine any deposits of metal that may exist on the Moon or on other planets.

　　(E) Methods for estimating the amount of copper available in currently known deposits have become very sophisticated and have proved quite accurate.

　　6.The world's annual food production slightly exceeds the amount of food required to provide a minimally adequate diet for the world's population. To predict that insufficient food production will cause a hunger crisis in the future is nonsense. Any hunger crisis will result from a distribution problem rather than a production problem.

　　The statement above assumes which of the following?

　　(A) The world's food requirements are greater than they will be in the future.

　　(B) A shortfall in the world's food production can be prevented by a better distribution system.

　　(C) The world's food production will continue to be sufficient to meet or exceed needs.

　　(D) The distribution of the world's existing food supply will be improved in the future.

　　(E) The world hunger crisis will not exist in the future.

　　7. Psychological maladjustment in children is caused by the stress of the birthing process as is proved by the  discovery of a positive relation- ship between the duration of the mother's labor and the amount of time the child spent crying in the first month of life.

　　Which of the following, if true, LEAST damages the author's assertion?

　　(A) There is no relationship between the amount of time spent crying and psychological maladjustment.

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