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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 定期对眼睛检查是很重要的，以便检查出任何可能的眼部疾病的征兆，这些疾病可能是没有症状的．

    解答 答案D．考查名词辨析．shadow"阴影，影子"；similarity"相似点"；sample"样品，样本"；symptom"症状，征兆"．故选D．

    点评 从句子中找出中心词，例如"examine""disease"可以得出正确答案．

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