Analysis of 47.5-million-year-old fossils from Pakistan has yielded fresh insights into the early ancestors of modern whales. For example, Maiacetus inuus was a land animal (i)_____ life in the sea. One Maiacetus innus fossil encased a fetus positioned for a head-first delivery, which is typical of a land mammal and suggests the species gave birth onshore. But it probably spent much of its time (ii)_____: its big teeth were suited for catching fish, while its flipper-like feet must have been (iii)_____ walking.
答案：C,D,H