Flatfish O) a6 C- b& _% S& D. t4 J
Members of the flatfish family, sand dabs and flounders, have an evolutionary advantage over many colorfully decorated ocean neighbors in that they are able to adapt their body coloration to different environments. These aquatic chameleons have flattened bodies that are well-suited to life along the ocean floor in the shallower areas of the continental shelf that they inhabit. They also have remarkably sensitive color vision that registers the subtlest gradations on the sea bottom and in the sea life around them. Information about the coloration of the environment is carried through the nervous system to chromatophores, which are pigment-carrying skin cells. These chromatophores are able to accurately reproduce not only the colors but also the texture of the ocean floor. Each time that a sand dab or flounder finds itself in a new environment, the pattern on the body of the fish adapts to fit in with the color and texture around it.
& K7 P: e6 e7 s( Y* Q 1. It is NOT stated in the passage that sand dabs
/ P# r8 a# r/ m; C. K: n; [ A are a type of flatfish' g4 H+ q) a( k9 I+ O3 D a
B are in the same family as flounders" n& t! L7 e3 h( i! y
C have evolved) p9 ]$ t, y* r3 `& D* G( Y
D are colorfully decorated' l+ m0 f( Y4 ]1 g" @1 q5 Z( G5 u
2. According to the passages, it is NOT true that sand dabs and flounders9 `4 ^! y& J% v& I: e8 |: }8 p$ B
A have flattened bodies D' V1 [* `; M0 t0 i: P
B live along the ocean floor
8 }% t, U; a$ X4 o' b C live in the deepest part of the ocean' F V* l+ v+ S
D live along the continental shelf
2 b& D- R' A. ~- B7 d 3. All of the following are stated about the vision of sand dabs and flounders EXCEPT that they are
) m# g: e! V' g A overly sensitive to light
3 Y* w8 w7 M- p8 E, W" ? B able to see colors
& s0 @# }& s$ ? C able to see the sea bottom! E" Z, s5 W# z# g
D aware of their surroundings# v" T1 P$ r( x/ m4 u
4. It is NOT true that chromatophores6 R- \1 v) Z3 f5 {. p
A are skin cells& e( q3 B+ F# q+ d8 n' I7 R/ H
B carry pigment
6 N$ K, b& n$ r' x/ p9 v C adapt to surrounding colors4 W/ h8 A2 \, ?4 ]; T8 i( U9 h
D change the ocean floor# o: j5 f# I1 S! J F
5. It is NOT mentioned in the passage that sand dabs and flounders! }9 e) Q& A5 X+ h7 ~7 ^+ H
A move to new environments' Y8 S3 S/ @0 W+ N! o
B adapt their behavior
# {5 y: `5 i1 M4 r) Z& o6 v! m( ^ C can change color
0 C5 J& |! U; R9 X/ p& j D adapt to textures around them
" ?, y- v- q# @6 {) ^ 参考答案：DCADB |
发表于 2012-8-14 23:21:39
