新GRE小短文阅读练习题五十四

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Eve r y fall, thousands of Canada geese migrate from Canada to the eastern United
' k0 a2 m" R0 j0 I4 b! R6 \* K States.  Recently, however, these geese have faced intense competition for food
from a subspecies of Canada goose that lives year-round in the eastern United
States.  To prevent the nonmigratory population from endangering the migratory
; X+ p% L+ Y- `8 e" b; c5 Vgeese, some groups have proposed allowing hunting of the nonmigratory geese.  
But since most hunters cannot visually distinguish the two subspecies, allowing any
* J  p4 i2 ~# P* _& ]  m9 m" ^2 k6 ~ hunting is surely unwise.
Which of the following, if true, most seriously weakens the argument?
9 b" x9 z5 ~% N1 b7 f& _A Hunting of the migratory Canada geese is permitted in some parts of Canada.  
B During the summer, only the nonmigratory geese are present in the eastern
! j& n/ R! C  }4 P  United States.  
C The migratory Canada geese do not interbreed with the nonmigratory Canada
  geese.  
& }$ d& ~  B! C. _' Y$ SD The migratory subspecies and the nonmigratory subspecies are not the only
  two subspecies of Canada geese.  
E The groups that have proposed allowing hunting of the nonmigratory geese
  have thoroughly studied both goose populations.  
答案B