【题目】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

【答案】A
【解析】句意：定期检查眼睛看看是否有眼疾症状很重要。A.symptom“症状”；B. similarity“类似”；C. sample“样本”；D.shadow“阴影”。根据句意，选A。