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The return of wolves benefits the grizzly bears because______.
The return of wolves benefits the grizzly bears because______.
admin
2015-09-30
42
问题
The return of wolves benefits the grizzly bears because______.
(3 - 1)Scientists say the return of wolves to Yellowstone National Park in the American state of Wyoming has boosted the diet of a rival predator, the grizzly bear.
Wolves returned to Yellowstone nearly 20 years ago, put back into the wild to prey on the growing elk population. Elk were overgrazing the grassland, causing damage to the precious ecosystem. Now scientists say the wolves have had benefits for another predator, the grizzly bear.(3 - 2)Trees and shrubs are springing back up, bearing nutritious berries, a valuable food source for the grizzly bear. Wild fruits are a key part of the bear’s diet as it gains weight before hibernating.
选项
A、wild fruits grew very well
B、elk population was increasing
C、precious eco-system was damaged
D、grizzly bears preyed on elks
答案
A
解析
本题设题点在新闻导语与结尾处。根据句(3—1)可知,科学家们认为狼群回归黄石国家公园大大提高了竞争对手捕食者——灰熊的饮食。由句(3—2)可知,灰熊最重要的食物是野生的水果,故答案为[A]。
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