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    【题目】To protect the rare birds better, scientists have been_____ the changes in their number in the past decade.

    A. securingB. chartingC. displayingD. undergoing

    【答案】B

    【解析】

    考查动词词义辨析。句意：为了更好地保护这种稀有鸟类，科学家们一直在记录它们在过去十年数量的变化。A. securing保护；B. charting详细记录；C. displaying显示；D. undergoing经历。根据句意选择B。

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