单选题 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.

【正确答案】 B

【答案解析】解析：本句意为：“有了颜色的帮助，动物的天敌就很难看到它。”watch意为“观看，注视”；see意为“看见，了解”；catch意为“抓住”；kill意为“杀死”。B项符合题意。

【正确答案】 B

【答案解析】解析：B项surroundings意为“环境”，符合题意，如：railway surroundings铁路周围环境。A项conditions意为“条件”；C项enemies意为“敌人”；D项bodies意为“身体”。

【正确答案】 C

【答案解析】解析：本句可译为：“只要他们不动，没人能看到他们。”谓语不完整，缺少表语部分。A项可排除；B项hardly无法使意思成立；D项possible常用形式为It’s possible…。

【正确答案】 D

【答案解析】解析：此处为省略句。根据前一句You probably have often“jumped’，a rabbit，完整的句子应为：If you have often jumped a rabbit…。A、B、C项均无法使句子正确。

【正确答案】 B

【答案解析】解析：B项coat意为“覆盖物(动物的毛)”，使句子意思完整，符合题意。A项surface意为“表面”；C项shape意为“形状”；D项appearance意为“面貌”，均不符合题意。

【正确答案】 A

【答案解析】解析：stand out意为“显眼，突出”；stretch out意为“伸手，开始大踏步走”；push out意为“把……推出去”；bring out意为“使显示，出版，产生”。只有A项正确。