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 题目和参考答案——青夏教育精英家教网——

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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