It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any .
A. symptom
B. similarity
C. sample
D. shadow
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(答案→)A. symptom
B. similarity
C. sample
D. shadow
解析：考查名词辨析。难度中等。
【解题思路】句意为：定期检查眼睛看看是否有眼疾症状很重要。A项意为“症状”，符合句意；B项意为“类似”，C项意为“样本”，D项意为“阴影”，都与语意不符。