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30.What is Pumera's hope for microrobots?They will be improved for wider use.B.They will replace other cleaning robots.阅读理解C.They will function normally without light.D.They will be highly praised for their operatingsystems.31.What is the main idea of the last paragraph?A.Microrobots have reached an advanced level.B.It's wise to use microrobots in open waterways now.C.Microplastics are increasing in variousenvironments.There are still many challenges concerningmicrorobots,