轻度精神发育迟滞患者虽然能掌握日常生活用语，但词汇贫乏以致不能完整表达意思。()
参考答案：错
When he was sixty years old, he _____ his hometown.
A．returned
B．returned back
C．returned to
D．went back
《学记》主张教学要遵循学生心理发展特点“学不躐等”，即教学要遵循____的原则。
