ANIMAL EXTINCTION
Many animals have disappeared during the long history of the earth.The most famous of these animals are dinosaurs(恐龙)．They lived on the earth tens of millions of years ago，long before humans came into being and their future seemed secure(安全的) at that time.There were many different kinds of dinosaur and a number of them used to live in China.The eggs of twenty-five species have been found in Xixia County，Nanyang，Henan Province.Not long ago a rare new species of bird-like dinosaur was discovered in Chaoyang County，Liaoning Province.When scientists inspected(检查) the bones，they were surprised to find that these dinosaurs could not only run like the others but also climb trees①.They learned this from the way the bones were joined together②.
动物灭绝
从地球有史以来的这段漫长时期，许多动物都消失了。这些动物中最有名的是恐龙。千百万年前，恐龙就在地球上生活，比人类的出现要早得多，当时它们的前景好像也很安全。当时有许多不同种类的恐龙，其中有很多种类曾经生活在中国。25个种类的恐龙蛋是在河南省南阳西峡县发现的。不久前，在辽宁省的朝阳县新发现了一种罕见的、形状像鸟一样的恐龙。科学家们观察它们的骨头时，惊奇地发现它们不仅跟其他恐龙一样可以跑，而且还可以爬树。科学家们是根据恐龙骨骼的连接方式得知的这些。
