Eve r y fall, thousands of Canada geese migrate from Canada to the eastern United+ m4 Z& @9 h5 c1 @
States. Recently, however, these geese have faced intense competition for food 5 E( u) B' ]* g6 I/ G
from a subspecies of Canada goose that lives year-round in the eastern United
+ @* ]/ F7 o* j States. To prevent the nonmigratory population from endangering the migratory
& v: A- F$ @& v7 {geese, some groups have proposed allowing hunting of the nonmigratory geese.
/ T4 h7 E" k+ k" T9 N, j! A0 `% c But since most hunters cannot visually distinguish the two subspecies, allowing any) {7 g: i* y0 r+ C
hunting is surely unwise. ; A9 z+ W- D, N6 c2 M& X
Which of the following, if true, most seriously weakens the argument? 1 y, E7 ], s! {9 K) H* A
A Hunting of the migratory Canada geese is permitted in some parts of Canada.
4 n" v) S' R) u( e7 GB During the summer, only the nonmigratory geese are present in the eastern
; x! {, b0 Q8 v& f- ^. P United States.
6 W2 C( E5 {2 p- k# D/ G; GC The migratory Canada geese do not interbreed with the nonmigratory Canada
6 F/ `" L% v8 j3 S7 B geese. , c- ~4 v) d4 n7 M
D The migratory subspecies and the nonmigratory subspecies are not the only
; B: B6 |% c% J- Q two subspecies of Canada geese.
& K) `' V' Z$ l/ U& r7 j8 fE The groups that have proposed allowing hunting of the nonmigratory geese
+ O8 v, l) ~, H- N have thoroughly studied both goose populations.
0 K3 Z! J, F8 c+ S2 m1 g* e% i答案B |
发表于 2012-8-15 12:40:43
