【图书简介】 “It’s time to go swapping，”Sherman’s mum tells him。But finding the right shell isn’t easy。Sherman wants one that’s spiky and cool，and Mum is looking for a sensible shell for her young hermit crab…A delightfully funny story that introduces shapes，size，and camouflage with a subtle environmental message。With additional activities and information，Flying Faxes are the perfect springboard for learning。-读书网|DuShu.com
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