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答案：A
解析：
Choice A is the best answer. The passage states that shark activity is causing declines in sea otter populations in some regions and may "fuel expansion into new areas." In this context, "fuel" most nearly means "stimulate." The passage is making the point that the presence of predators may stimulate the movement of sea otters into other areas—that is, that it may cause the otters to go to new locations.
