2. 短文第二句指出知更鸟在老橡树上筑巢,所以答案为 C. On an oak tree。 3. 文中提到Mrs Robin 会在巢穴里产卵,因此答案为 B. Lay eggs in the nest。 4. 文中明确说明知更鸟的蛋是蓝色的,所以答案为 C. Blue。 5. 根据常识,鸟蛋孵化后会变成小鸟,因此答案为 C. Baby robins。反馈 收藏 ...
Overall, our results best support the scenario wherein egg rejection is the outcome of selective pressure by a nonmimetic brood parasite, because robins are efficient rejecters of foreign eggs, irrespective of the color variation within their own clutch.Rebecca...
were only five black robins left in the world. They all lived on a small island off the coast of New Zealand. Only one of those birds, a female called Old Blue, was able to lay eggs. Wildlife workers began a programme for raising ...
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