2. 考研
  3. Color【C1】______to make an animal difficult for its enemies to【C2】______Many animals match their surroundings so well that as lon

Color【C1】______to make an animal difficult for its enemies to【C2】______Many animals match their surroundings so well that as lon

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问题     Color【C1】______to make an animal difficult for its enemies to【C2】______Many animals match their surroundings so well that as long as they do not move no one is【C3】______to see them.You probably have often "jumped" a rabbit.If you【C4】______,you know how the rabbit sits perfectly still until you are just a few feet away.You【C5】______see the rabbit till it runs for its【C6】______matches very closely the place where it is sitting.Many times you may have walked past a rabbit【C7】______didn’t run and you never knew it was there at all.One of the most usual color schemes that helps animals to keep from being seen, is a dark back and light underpants, if an animal is the same color all【C8】______,there is always a dark shadow along the animal’s belly (腹部).【C9】______an enemy couldn’t see the animal he could see this dark shadow.The shadow makes the animal stand out to view. But if the belly is【C10】______than the rest of the animal,the shadow will not be noticed.
【C5】
选项 A、sometimes
B、occasionally
C、seldom
D、often
答案C
解析 seldom意为“很少，不常”，有否定含义，符合题意。occasionally意为“偶尔”，A、B、D三项是三个频度副词，均无否定含义。
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