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4．Young adults who quit smoking saw ____ in coughing and other symptoms within a few weeks，a new study indicates．（　　）
A．developmentB．movementC．discouragementD．improvement

分析 一項新的研究顯示：戒掉煙的年輕人在幾周之內看到了咳嗽和其他癥狀得到了改善．

解答 答案：D
development發(fā)展；movement 運動；discouragement沮喪，挫折；improvement提高，改善．根據題干一個定語從句修飾年輕人"young adults who quit smoking"和后面"coughing"的關系，結合常識可以得知戒煙之后咳嗽是可以改善的，并在熟知名詞詞義的基礎之上，故選D．

點評 本題考查名詞的詞義辨析，在熟知名詞詞義的基礎之上結合具體的語境，得出答案．

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