问题
选择题
(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
答案
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。