Teaching and learning greatly from each other —they are two entirely different processes.
A. differ
B. disagree
C. pare
D. transform
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(答案→)A. differ
B. disagree
C. pare
D. transform
解析：句意：教与学彼此之间是不同的，它们是两个完全不同的不同的过程。Differ相异；disagree不同意；pare比较；transform转变。根据句意故选A。