A:生物进化的直接证据是化石
B:生物进化的趋势是由简单到复杂
C:生物进化是自然选择的结果
D:生物进化的原因是生物遗传
根据以上实验事实判断:
等高线地形图表示山谷地形的是( )
读短文,填空
Hello ! My name is Amy .I'm a girl .I'm from England. Look !This is my father and this is my mother .My father is a teacher. My mother is a doctor .The boy is my brother .He's eight .He's a student .who's this girl ? Can you guess??