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Lemuel has recently entered the concrete operational stage.

What can he do now that he could NOT do when he was in the preoperational stage?

A

Understand that a liter of water in a tall jug is the same as a liter of water in a wide jug.

B

Use language.

C

Understand that objects exist when he cannot see them.

D

Complete algebraic problems.

E

Answer moral questions based on a sense of "justice" or "human rights."

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