6.Once common throughout the Western plains, black-footed ferrets are thought to have declined in number as a result of the poisoning of prairie dogs, their prey.
# 曾经很平常遍布西部平原，黑色脚的雪貂被认为减少了/数量上/由于这个的结果/中毒/牧羊犬的/, (牧羊犬)是雪貂的猎物。
7.The most favorable locations for the growth of glaciers are not the cold, dry polar regions but the cool, moist middle latitudes, where there is abundant precipitation and where it is cold enough to allow some snow to accumulate year by year.
8.In the 1950's astronomers were divided between those who believed the universe began with a cosmic explosion (the "big bang") and those who favored the model of an eternal and infinite steady-state universe.
# 在 50 年代，天文学家被分成(两大阵营)，一些人相信宇宙开始/以宇宙大爆炸(大爆炸)和另一些人/相信这个模型/一个永久的无限的逐渐变化的宇宙的。
9.Citing evidence that the carbon dioxide content of the atmosphere has increased more than seven percent in the last 30 years, many scientists have expressed a fear that destruction of forests and continued use of fossil fuels will cause an irreversible shift in Earth's climatic pattern.
10.Prompted by new evidence that the health risk posed by radon gas is far more serious than was previously thought, authorities are advising property owners to test all dwellings below the third floor for radon gas and to make repairs as needed.