29. Why does the author mention the specimen preserved in the birth canal (line 19)?
(A) To illustrate that the embryo fossils are quite advanced in their development
(B) To explain why the fossils are well preserved
(C) To indicate how the ichthyosaurs died
(D) To prove that ichthyosaurs are marine animals.

答案：登入後查看
統計： A(9), B(1), C(1), D(2), E(0) #802767