题目内容
Radium salts,which have been found to ______ in bones,give rise to bone cancer.
A. pile up B. build up C. keep up D. pull up
【答案】
B
【解析】略

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题目内容
Radium salts,which have been found to ______ in bones,give rise to bone cancer.
A. pile up B. build up C. keep up D. pull up
B
【解析】略