题目:阅读下面材料后,按要求作文。恐龙是古爬行动物,种类繁多,体型各异,小的体长不到一米,大的体长数十米,重达四五十吨。有食肉的,也有食植物的。它们在地球上的陆地或沼泽附近生活了大约一亿四千万年,比只有二百万年的人类历史长多了,它们在地球上曾称霸一时。可是,很久很久前的某一天(或许是某一时期)里,它们在地球上却突然神秘地消失了。 Title: After reading the following materials, write the composition as required. Dinosaurs are ancient reptiles with a wide variety of body types. The small ones are less than one meter long and the large ones are tens of meters long and weigh 40 to 50 tons. There are carnivorous, but also edible plants. They lived about 140 million years on the earth’s land or in the vicinity of swamps, which is much longer than the human history of only 2 million years. They once dominated the earth. However, on a certain day (or perhaps a certain period) a long time ago, they suddenly disappeared mysteriously on Earth.