【題目】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】

考查動詞詞義辨析。句意：為了更好地保護這種稀有鳥類，科學(xué)家們一直在記錄它們在過去十年數(shù)量的變化。A. securing保護；B. charting詳細(xì)記錄；C. displaying顯示；D. undergoing經(jīng)歷。根據(jù)句意選擇B。

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