【题目】The failure was a big _____ to him, but he wasn't discouraged and soon got as enthusiastic as ever.
A.blow
B.issue
C.excuse
D.factor

【答案】A
【解析】考查名词辨析A. blow打击； B. issue问题； C. excuse借口； D. Factor要素，该句意思为这个失败对他来说是个打击，但是他没有泄气，很快振作恢复了原来的热情，故选A。