Which of the following can NOT be considered a feature of a constructivist Mathematics classroom?

Using objective type test items as the primary means of assessment is NOT a feature of a constructivist mathematics classroom. Constructivist assessment uses diverse methods like portfolios, projects, observations, open-ended problems, and discussions that capture students' thinking processes and conceptual understanding. The other features - emphasizing language and dialogue, acknowledging multiple constructions of understanding, and highlighting cross-curricular connections - are all hallmarks of constructivist pedagogy.