自2013年12月考次起，全国大学英语四、六级考试委员会将对四、六级考试的试卷结构和测试题型作局部调整。快来一睹四六级新题型的风采吧~
The hole is the door of the nest. A third bird is called the oven bird. The oven bird makes a nest that is very solid. The nest is made of mud. The oven bird forms the mud into the shape of an oven and then lets it dry in the sun. The sun bakes the mud, making it very hard. Not all birds make their homes in branches. Some birds build their nests on the ground, while others bury their eggs under the ground. And some birds do not build nests at all. So when you look for nests and eggs in the branches of the trees and bushes, remember that some nests may be right under your feet.