相关Pearlsgrowinsideshel的文学知识

问题详情：阅读短文并根据其内容回答问题。简要回答，不准照抄原文中的句子   Pearlsgrowinsideshellfish（贝类动物）.Shellfishhavehardshells.Theyopenandclosetheirshellstocatchtheirfood.Theirshellsareusuallygreya...