解析：Color is very important to mo
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【单选题】
Color is very important to most animals for it helps them to get along in the worlD、Color {{U}} (21) {{/U}}to make an animal difficult for its enemies to {{U}} (22) {{/U}}. Many animals match their {{U}} (23) {{/U}} so well that as long as they do not move no one is {{U}} (24) {{/U}} to see them. You probably have often "jumped" a rabbit. If you {{U}} (25) {{/U}}, you know how the rabbit sits perfectly still {{U}} (26) {{/U}} you are just a few feet away. You {{U}} (27) {{/U}} see the rabbit till it runs for its {{U}} (28) {{/U}} matches very closely the place where it is {{U}} (29) {{/U}}. Many times you may have walked past a rabbit {{U}} (30) {{/U}} didn’t run and you never knew it was there at all.
One of the most usual color schemes that helps animals to keep {{U}} (31) {{/U}} being seen, is a dark back and light underpants. If an animal is the same color all {{U}} (32) {{/U}}, there is always a dark shadow along the animal’s belly (腹部). {{U}} (33) {{/U}}an enemy couldn’t see the animal he could see this dark shadow. The shadow makes the animal {{U}} (34) {{/U}} out to view.But if the belly is {{U}} (35) {{/U}} than the rest of the animal, the shadow will not be noticeD、
A．helps
B．contributes
C．tries
D．manages
网考网参考答案：A
网考网解析：[解析] A项helps意为“帮忙，帮助”，符合题意。B项contributes意为“贡献”；C项tries意为“试图”；D项manages意为“设法”。
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