题目内容:
ThefossilofababydinosaurintheskeletonofR.robustusindicatesthat
A.R.robustusmusthavediedinitspregnancy. B.thismammalcouldhavediedwhilefightingwithdinosaurs.
C.R.robustusswallowedthebabydinosaurasitsfood.
D.mammalswouldeattheiryoungwhenstarved.
参考答案:
答案解析: