题目

化石是生物的遗体、遗物或生活痕迹，由于种种原因被埋藏在地层中，经过若干万年的复杂变化形成的．如图是某地区各个地层中生物化石的分布情况，请你仔细观察、比较并回答问题． （1） 请你根据如图总结出生物进化的规律：。 （2） 将下列生物类群按照你总结的规律排序：哺乳类、鱼类、两栖类、软体动物、爬行类。 —What did you say to Lily just now? She looked so happy. —I praised her new hair style, saying, "______." A．you look younger and more beautiful B．she is more beautiful and younger C．you looked more beautiful and younger D．she was more beautiful and younger