单项选择题哪种症状是营养性巨幼红细胞性贫血特有的表现是( ) A. 红细胞减少 B. 疲乏无力 C. 食欲不振 D. 心率增快 E. 神经、精神症状
多项选择题The English teacher can model the instructions for a speaking activity _____ . A、on their own B、with a student C、with student pairs D、with the whole class