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发布时间：2006-06-22 13:26     点击：

    24. The passage suggests which of the following about the Hawaiian Islands, the Austral Ridge, and the Tuamotu Ridge?

    (A) The three chains of islands are moving east- ward.

    (B) All the islands in the three chains have stopped moving.

    (C) The three islands chains are a result of the same plate movement.

    (D) The Hawaiian Islands are receding from the other two island chains at a relatively rapid rate.

    (E) The Austral Ridge and the Tuamotu Ridge chains have moved closer together whereas the Hawaiian Islands have remained stationary.

    25. Which of the following, if true, would best support the author's statement that hot-spot activity may explain the mutability of continental plates?

    (A) Hot spots move more rapidly than the continental and oceanic plates.

    (B) Hot spots are reliable indicators of the age of continental plates.

    (C) Hot spots are regions of volcanic activity found only in the interiors of the continental plates.

    (D) The alignment of hot spots in the Pacific. Ocean parallels the alignment of Pacific Ocean islands.

    (E) The coastlines of Africa and South America suggest that they may once have constituted a single continent that ruptured along a line of hot spots.

    26. The author's argument that hot spots can be used to reconstruct the movement of continental plates is weakened by the fact that

    (A) hot spots are never found at the boundaries of plates

    (B) only extinct volcanoes remain after a plate moves over a hot spot

    (C) lava flow patterns for all hot spots have not been shown to be the same

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