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 Mariacetus inuus 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.
Blank (i)
Blank (ii)
Blank (iii)
A. resistant
D. in the water
G. incompatible with
B. removed from
E. fleeting from predators
H. clumsy for
C. adapted to
F. protecting its young
I. strengthened by
答案请点击下一页>>