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  3. Global warming looks like it will be a bigger problem for the world’s fish species than scientists first thought; A new study sh

Global warming looks like it will be a bigger problem for the world’s fish species than scientists first thought; A new study sh

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问题     Global warming looks like it will be a bigger problem for the world’s fish species than scientists first thought; A new study shows that when fish are laying eggs, they are more vulnerable to hotter water. With medium-level human-caused climate change expected by the end of the century, the world’s oceans, rivers and lakes will be too hot for about 40％ of the world’s fish species in the egglaying stage, according to a study. That means they could go extinct or be forced to change how and where they live and reproduce.
    Until now, biologists had just studied adult fish. For adult fish, around 2％ to 3％ of the species would be in the too-hot zone in the year 2100 with similar projected warming. So using this new approach reveals a previously unknown problem for the future of fish, scientists said. In a worst case climate change scenario the figure for species in trouble jumps to 60％. These vulnerable times in the life of a fish make this a "bottleneck" in the future health of species, said Hans-Otto Portner, a marine biologist at the Alfred Wegener Institute in Germany.
    A marine heatwave last year caused large numbers of migrating salmon fish to die throughout Alaska’s rivers. It also killed off cod fish eggs, showing what a warmer future might be like, said Flemming Dahlke, a marine biologist at the institute. "With those fishes most sensitive to warming waters, it means fish populations won’t be able to replace themselves," said Rutgers University ecologist Malin Pinsky. "Without reproduction and offspring, we have no fish, no fishing and no fish on our plates. "
    In studying 694 species, Dahlke and Portner found some of the fish likely to be hardest hit by this phenomenon include Alaska pollock—the biggest fishery in the United States and the source of fast food fish slices—and well-known fish species such as sockeye salmon, brown trout, bonito, barracuda and swordfish. "The more we allow temperature to change, the more we will lose the natural foundation of human life, including food from the sea," Portner said. When it gets too warm for living, the species could still possibly move to someplace cooler or lay at another time, but that’s not easy, Dahlke said. "This could mean a lot of problems to many species.
The author mentioned Alaska pollock to________.
选项 A、show how human life would be affected
B、demonstrate how it was hardest hit
C、introduce the biggest fishery in the United States
D、illustrate the source of fast food fish slices
答案A
解析 细节题。根据题干关键词Alaska pollock可定位至第四段第一句some of the fish likely to be hardest hit by this phenomenon include Alaska pollock—the biggest fishery in the United States and the source of fast food fish slices，再结合下句The more we allow temperature to change，the more we will lose the natural foundation of human life，including food from the sea可知，介绍阿拉斯加鳕鱼是为了举例说明人类生活会受到重大的影响，故A项项正确。B项以偏概全，原文并没有介绍该鱼类是如何受到严重影响的。C项和D项都是在陈述事实，但并不是作者提到阿拉斯加鳕鱼的根本目的，因此排除。
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