[单选题]Directions: In this part there is a sentence with one word or phrase underlined. Choose the one from the four choices marked A, B, C and D that best keeps the meaning of the sentence.
The operation could prolong his life by two or three years.（）

protect

extend

decline

narrow

正确答案：B

题目解析

本题考查常见动词的词义辨析。
protect“保护、保卫”，extend“延长、扩展”，decline“婉拒”，narrow“使…变窄、限定”。这里需要选择与prolong“延长”相近的词，故选B。
句意：这次手术可使他多活两三年。

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[单选题]Directions: In this part there is a sentence with one word or phrase underlined. Choose the one from the four choices marked A, B, C and D that best keeps the meaning of the sentence.The operation could prolong his life by two or three years.（ ）