小学阶段的课程应体现普及性、基础性和（ ） A.民族性B.地域性C.直观性###SXB##

公司的优先股经常以低于其债券的收益率出售。这是因为： a．优先股通常有更高的代理等级。 b．优先股持有人对公司的收入有优先要求权。 c．优先股持有人在公司清算时对公司的资产有优先要求权。 d．拥有股票的公司可以将其所得红利收入免征所得税。 点击查看答案

Mary Arming (1799—1847) was a British fossil hunter who began finding【21】as a child, and soon supported herself and her very【22】family by finding and selling fossils. Very【23】is known about her life, but her father was a cabinet maker and he also【24】local fossils. Mary【25】on the southern coast of England, in a town called Lyme Regis. Its famous【26】by the sea contain【27】fossil layers that【28】from the Triassic, Jurassic and Cretaceous periods (the【29】of the dinosaurs, other bizarre reptiles, large insects, sea creatures,【30】mammals, and【31】life forms). Mary Arming【32】and prepared the first fossilized plesiosaur (an ocean-dwelling reptile) and the first Ichthyosaurus (an ocean-dwelling reptile that【33】like a dolphin). She found many other important fossils, including Pterodactylus (a flying reptile), sharks (and other fish), and so on.【34】with her brother Joseph, Mary supplied prepared fossil specimens to【35】museums, scientists, and private collections.(36)A．cliffsB．dinosaursC．fossilsD．museums 点击查看答案