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9．It is important to have your eyes examined regularly to check for any sign of eye disease
that may not have any ________．（　　）
A．shadowB．similarityC．sampleD．symptom

分析 定期對眼睛檢查是很重要的，以便檢查出任何可能的眼部疾病的征兆，這些疾病可能是沒有癥狀的．

解答 答案D．考查名詞辨析．shadow"陰影，影子"；similarity"相似點"；sample"樣品，樣本"；symptom"癥狀，征兆"．故選D．

點評 從句子中找出中心詞，例如"examine""disease"可以得出正確答案．

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