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  3. According to the passage, an organism without hard body parts Why does the author mention "aragonite" in line 26

According to the passage, an organism without hard body parts Why does the author mention "aragonite" in line 26

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问题  According to the passage, an organism without hard body parts
  Why does the author mention "aragonite" in line 26
选项 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
答案D
解析
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