大学英语：astronomer: n 天文学家;astronomy: n 天文学

　　1. astronomer: n 天文学家;astronomy: n 天文学

　　2.explode: v 爆炸,由此联想：explosive: a 爆炸性的/n 炸药;explosion: n 爆炸

　　1). When the bomb______, many people were seriously wounded.

　　2). The unexpected ________ frightened the little girl.

　　3). It might be possible to convert _____ energy into heat.

　　Answers: exploded, explosion, explosive

　　3. density: n 密度;联想产生：dense: a 密度大的，反义词：sparse;

　　densely: ad高密度地;densely-populated人口稠密的;sparsely-populated人口稀疏的

　　1). The ____ fog kept the travelers from finding the correct direction.

　　2). The business area of the city is _____ populated.

　　3). This liquid has a much greater ____ than water.

　　Answers: dense, densely, density

　　4. shrink: v 收缩、退缩、缩水

　　1). As a result of careless washing, the jacket has shrunk to a child's size.

　　2).The girl shrinks at the sight of blood.