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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.
According to Paragraph 3, a warmer world would________.
选项 A、be difficult for human beings to live in
B、facilitate the reproduction of fish species
C、kill all the fish and fish eggs
D、make fish more vulnerable to the environment
答案D
解析 细节题。根据题干关键词warmer可定位至第三段第二句showing what a warmer future might be like，结合前面第一句和第二句前半句A marine heatwave last year caused large numbers of migrating salmon fish to die throughout Maska’s rivers. It also killed off cod fish eggs可以得知，温度更高的水会杀死大部分的鱼和鱼卵，但并不是全部，C项 以偏概全，错误。B项与原文表述相反，温度更高的水会影响鱼类的繁殖，而不是促进鱼类繁殖，因此该选项错误。A项在原文并没有提及，属于主观臆断，错误。因此，D项项为本题的正确答案。
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