(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．symptomB．similarity
C．sampleAD．shadow
句意：定期檢查眼睛看看是否患上可能無任何癥狀的眼疾，這很重要。symptom意為“癥狀；癥候”；similarity意為“相似”；sample意為“樣本”；shadow意為“陰影”。A項(xiàng)符合句意。
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