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Traditional classroom instruction is (i)_____ for helping students construct a correct mental model of the lunar phases. Even in-class instruction augmented with a 3-D instead of a 2-D visual model has (ii)_____ student learning. There is a clear need for new and better approaches to the teaching of lunar phases.
- yielded promising results for
- posed novel questions about
- had little effect on
insufficient , had little effect on 显示答案