词汇题练****tpo1-7Theword“precious”,thePakicetusfossilprovidespreciousdetailsontheoriginsof……Theword“exposed”,Basilosaurus,werefoundinsedimentsleftby…“propulsion”,however,thatitswamlikemodernwhalesbymovingtherearportionofitsbodyupanddown,“threatened”--fourthoftheEarth’“delicate”“progressively”“devoidof”inthepassageisclosestinmeaningtoConsis
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