Why does the author mention "aragonite" in line 26
A.To explain why fossils are rare
B.To compare aragonite fossils and calcite fossils
C.To argue that certain fossils are more informative than others
D.To illustrate the kinds of inorganic hard parts that can form. fossils
第5题
A. 可同时伴有胃体黏膜灶性萎缩
B. B.可伴有浅表性胃炎
C. C.可能与幽门螺杆菌无关
D. D.可能与胆汁反流有关
E. E.治疗时不能用抗酸或抑酸药物
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