第21篇 The giraffe is the tallest modern land animal. It can be over 5. 5meters tall. Its neck alone may be 1. 9 meters long. Yet the giraffe has onlyseven bones in its neck, the same number as in the humans’. Even a small birdhas many more bones in its neck than a tall giraffe. Each bone in a giraffe’sneck is very long, while the bones in a human’s neck are short. That makes thedifference. A female giraffe gives birth to one baby at a time. The baby,called a calf, is about 1. 9 meters tall at birth. By the age of eight it isfull-grown. The giraffe eats mostly leaves. Because it has a long neck, it canreach the high leaves on the trees. 根据短文内容,选择正确答案。