複選題49. From (A) to (F) below, choose the ONES that are true of the fossil deposits mentioned in the passage. （多選題，4 分） (A) Ichthyosaurs lived in freshwater environments. (B) Holzmaden yields thousands of well-preserved fossils. (C) The embryos found are poorly developed. (D) Holzmaden’s fossils are mainly male ichthyosaurs. (E) Ichthyosaurs lived in environments less prone to erosion. (F) Young ichthyosaurs are common in fossil sites worldwide.