2. 外语
  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【C3】______so well that as long as they do not move no one is【C4】______to see them. You probably have often "jumped" a rabbit. If you【C5】______, you know how the rabbit sits perfectly still【C6】______you are just a few feet away. You【C7】______see the rabbit till it runs for its【C8】______matches very closely the place where it is【C9】______. Many times you may have walked past a rabbit【C10】______didn’t run and you never knew it was there at all.
    One of the most usual color schemes that helps animals to keep【C11】______being seen, is a dark back and light underpants. If an animal is the same color all【C12】______, there is always a dark shadow along the animal’s belly(腹部).【C13】______an enemy couldn’t see the animal he could see this dark shadow. The shadow makes the animal【C14】______out to view. But if the belly is【C15】______than the rest of the animal, the shadow will not be noticed.
【C7】
选项 A、sometimes
B、occasionally
C、seldom
D、often
答案C
解析 C项seldom意为“很少，不常”，有否定含义，与题意相符。B项occasionally意为“偶尔”，A、B、D项三个频度副词均无否定含义。
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