◎ 题干
Radium salts,which have been found to ______ in bones,give rise to bone cancer.
A.pile up B.build upC.keep up D.pull up
◎ 答案
查看答案
◎ 解析
查看解析
◎ 知识点
    根据n多题专家分析,试题“Radium salts,which have been found to ______ in bones,give rise to bone cancer.A.pile upB.build upC.keep upD.pull up…”主要考查了你对  【动词短语】【动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。