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2011-09-15 13:46:00   来源：网络整理    双击单词自动翻译

　　(B) structure of the skeleton of the pterosaurs suggests a close evolutionary relationship to bats

　　(C) fossil remains of the pterosaurs reveal how they solved the problem of powered flight

　　(D) pterosaurs were reptiles

　　(E) pterosaurs walked on all fours

　　2.The author views the idea that the pterosaurs became airborne by rising into light winds created by waves as

　　(A) revolutionary

　　(B) unlikely

　　(C) unassailable

　　(D) probable

　　(E) outdated

　　3.According to the passage， the skeleton of a pterosaur can be distinguished from that of a bird by the

　　(A) size of its wingspan

　　(B) presence of hollow spaces in its bones

　　(C) anatomic origin of its wing strut

　　(D) presence of hook like projections on its hind feet

　　(E) location of the shoulder joint joining the wing to its body