Life Cycle

　　Robins mate (交配) in the spring from April through to July. A female robin may breed two or three times a season. A female robin builds a cup－shaped nest with soft tree branches, with the mud, she will add grass and other soft materials. Sometimes a male robin helps to collect materials for the nest. The nest is built five to fifteen feet above the ground in a tree or bush. Sometimes a robin builds its nest on a window ledge. A female robin will lay three to five eggs at a time and it will take about two weeks before the baby robins are born.

　　(D)21. What is the color of male American robins' chest feathers?

　　A. Dark gray.

　　B. Brown

　　C. Gray.

　　D. Reddish－orange.【解析】细节理解题。 根据第一部分第二句话“The male American robins have dark gray or brown back wing feathers and reddish－orange chest feathers.”可知D正确。(C)22. What do we know about American robins' life cycle，according to the last paragraph?

　　A. Robins only mate in April and July.

　　B. Male robins help to spread mud on the inside of the nest.

　　C. A robin's nest may be found on a window ledge.

　　D. A female robin may lay two or three eggs at a time.

　　【解析】细节理解题。 根据第三部分第一句话“Robins mate (交配)in the spring from April through to July.”可以排除A；根据第五、六句话“After she lines the nest with the mud, 可以排除B; 根据最后一句话“A female robin will lay three to five eggs at a time”可以排除D。(B)23. The passage is most likely to be taken from ________．【解析】推理判断题。根据全文可知这篇文章专门介绍了知更鸟的外形特征分布及习性跟自然息息相关所以选B。B

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