（B） remain controversial， although statistics clearly associates a reduced life expectancy with
（C） remain controversial， although statistics clearly associates reduced life expectancy to
（D） remains controversial， although statistics clearly associate a reduced life expectancy with
（E） remains controversial， although statistics clearly associates reduced life expectancy to
45. If industrial pollution continues to deplete the ozone layer， the resulting increase in ultraviolet radiation wil1 endanger human health， causing a rise in the incidence of skin cancer and eye disease， and perhaps even threatening global ecological systems.
（A） and perhaps even threatening
（B） and may even threaten
（C） and even a possible threat to
（D） as well as possibly threatening
（E） as well as a possible threat to
46. Quasars are so distant that their light has taken billions of years to reach the Earth； consequently，we see them as they were during the formation of the universe.
（A）we see them as they were during
（B）we see them as they had been during
（C）we see them as if during
（D） they appear to us as they did in
（E）they appear to us as though in
47.Unlike that of the Native Americans of British Columbia，the Plains，and the Southwest， those of Puget Sound lived in relatively small， autonomous villages.
（A） Unlike that of
（B） Unlike those of
（C） Unlike
（D） In contrast to that of
（E） Dissimilar to
参考答案：BCDCD BEADA CCEAA CBADB EBCEA BEDBA C
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