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1.（1）D，（2）C，（3）A。
2.（1）Sponges can be used for many things, such as cleaning and painting. (2)Sponges live under water. The water beings them air,little plants and animals to feed on.
2.（1）Sponges can be used for many things, such as cleaning and painting. (2)Sponges live under water. The water beings them air,little plants and animals to feed on.
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