To protect the rare birds better, scientists have been the changes in their number in the past decade.

1. To protect the rare birds better, scientists have been the changes in their number in the past decade.

A. securing B. charting C. displaying D. undergoing

【考点】

动词的词义辨析;

【答案】

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单选题容易

1. You are old enough to your own living.

C. take D. earn

单选题容易