(2012·湖北)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. sampleA
D. shadow
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A. symptom
B. similarity
C. sampleA
D. shadow
解析：句意：定期检查眼睛看看是否患上可能无任何症状的眼疾，这很重要。symptom意为“症状；症候”；similarity意为“相似”；sample意为“样本”；shadow意为“阴影”。A项符合句意。