2. 专升本
  3. A national political struggle is continuing over the issue of protection for the remnants(残余)of vast ancient forests that once c

A national political struggle is continuing over the issue of protection for the remnants(残余)of vast ancient forests that once c

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问题     A national political struggle is continuing over the issue of protection for the remnants(残余)of vast ancient forests that once covered the northwestern areas of the United States. These old forests, called "old growth", contain trees from 200 to 1200 years old. There are now about 6 million acres of virgin(原始的)forest on Washington and Oregon, only about one-tenth of what existed before the 1880s. This low growth contains some of the most valuable timber in the nation, but its economic worth is also contained in its water, wildlife, scenery, and recreational facilities.
    Conservationists want the majority of existing old growth protected from harvesting. They emphasize the vital relationship between old growth and the health of the forest’ s ecosystem(生态系统). They cite studies which show that both downed and standing old trees store and release nutrients necessary to younger trees.
    On the other hand, much of the Northwest’s economy is developed around the logging(伐木)industry. Trees are cut down to make wood products, and many mills are geared(开动)for old-growth industry. In recent years, 500 acres of old growth have been logged, including trees up to 500 years old and eight feet in diameter. While the U. S. Forest Service wrestles(全力对付)with the problem of how much of the forest to save, the harvesting of timber continues. The district office refuses to remove any of the old growth from timber production. The struggle is continuing at the national level with strong proponents on both sides.
Studies show that young trees gain nutrients from______.
选项 A、wildlife
B、virgins
C、old trees
D、wood products
答案C
解析
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