有关AandB的单复数问题.Self-studyandautonomouslearningareencouragedwiththeassistanceofacomputer.Self-studyandindependentlearningusingtechnologyisameansofteachingthatcanbehighlyeffectiveforpracticedrills,thestud

Question

有关A and B 的单复数问题.
Self-study and autonomous learning are encouraged with the assistance of a computer.
Self-study and independent learning using technology is a means of teaching that can be highly effective for practice drills,the study of factual knowledge,or for pure rote memorization.
为何前者的“Self-study and autonomous learning ”算作复数,而后者算作单数呢?

Answer 1

前面是两种学习方式,后面是一种学习方式