Some scientists claim that a cuttlefish's eyes are incapable of + E5 F! H+ q. |) Q+ W) V
distinguishing between yellow and red, but cuttlefish can camou-
" F9 i/ `, m4 C0 q! |flage themselves by exactly matching the color scheme of their 4 E) ^$ V2 d/ [! m* L
surroundings, which often includes yellow or red or both. Since - A$ J) b6 S2 g# Z9 C
cuttlefish could not match the colors of their surroundings without
, b6 B n; r9 G* |1 X; k jhaving some capacity to distinguish between those colors, the * N, @& P {( I
scientists' claim must be wrong. C% |) h) u' {1 a1 |# T
Which of the following is an assumption on which the argument is
0 A2 W0 O* V, n. Tbased?9 J, {. Z2 Z# V/ e1 r
A Yellow and red are the two most common colors in a cuttle-
1 T) `1 ^# M% @% v8 m- ~1 X fish's environment.
- {. n7 s# x0 ?' B B Cuttlefish never change their color except to match their
3 ^: @7 `0 l' j" h: u) w, S surroundings.
( c5 f y2 s! p7 a0 Y: I C There are never more than two colors present in the sur-1 N1 r% U) l9 v8 I) Z, t( f
roundings of a cuttlefish. y5 ?8 e- C5 u3 |
D Cuttlefish do not distinguish colors without using their eyes. ( K0 v- h& l+ Q7 W8 n8 a! ~: B: O
E There are no colors that cuttlefish cannot match exactly.
. E( r) Q0 F$ t) }答案：D |
发表于 2012-8-15 12:40:43
