These two kinds of ways are totally different in nature, and we should not the two.
A. confuse
B. embarrass
C. disappoint
D. discourage
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(答案→)A. confuse
B. embarrass
C. disappoint
D. discourage
解析：句意：这两种方式在本质上完全不用，我们不应该把它们弄混了。confuse使混乱；embarrass尴尬；disappoint失望；discourage泄气。根据句意故选A。