【单选题】The discovery of a new type of ceratopsian dinosaur suggests ceratopsians ______.
A.migrated to North America around 70 -- 80 million years ago
B.arrived in Asia from North America about 90 million years ago
C.originated in Asia and later migrated to North,America
D.could have moved to Asia from North America long ago
发布评论 查看全部评论