2. 考研
  3. Color is very important to most animals for it helps them to get along in the world. Color【C1】______ to make an animal difficult

Color is very important to most animals for it helps them to get along in the world. Color【C1】______ to make an animal difficult

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问题     Color is very important to most animals for it helps them to get along in the world. 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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