答案　D解析　文章出处题。本文主要讲述的是1988年失控的森林大火给黄石国家公园带来的损害因此本文与地理风情有关。故选D项。

　　All

　　across

　　California,

　　honeybees are flying away from their hives (蜂箱) and dying.

　　Empty hives are causing a lot of worry about some important food crops.(授粉昆虫)—they enable plants to produce the fruits and nuts we enjoy by carrying pollen from one plant or flower to the next. The wind pollinates oats, (like apple and cherry trees and melon vines) depend on insects, bats, and birds. In the U. S．， millions and millions of bees kept by human beekeepers fly around doing a lot of this important work for food crops.“Bees are worth protecting because their work adds

　　so much to our diet，” says Dr.

　　Jeff Pettis of the Bee Research Laboratory.

　　California's almond crop alone depends on about half the bees in the country. But now the almond crop and many others could be in trouble with so many bees dying.

　　Researchers at government and university labs all over the country are trying to figure out why so many bees are dying. However, bees are hard to study. Most die away from the hive, so researchers don't have dead bodies to examine. And when researchers return to a hive after two weeks, about half the bees they studied on their first visit will be dead, replaced by new ones in the natural life cycle of bees. “It isn't like studying a large animal like a cow that doesn't move around much and is easy to find out in the cow field，” says Pettis.

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