A.2
B.
C.
D.1
[单选题]A.2B.C.D.1
[单选题]A.颌骨逐渐增大B.颅骨逐渐减小C.咀嚼器官进化增强D.出现牙列拥挤E.以上都不是
[单选题]A.86.1~6.4B.87.3~7.4C.86.8~6.9D.87.5~8.3E.83.9~4.0
[单选题]A.B.C.D.
[单选题]A.B.C.D.E.
[判断题]A.对B.错
[单选题]A.πB.C.D.