Radium salts, which have been found to in bones, give rise to cancers of the bone.A. pile

发布时间：2020-08-14 23:37:42

Radium salts, which have been found to      in bones, give rise to cancers of the bone.
A. pile up
B. build up
C. keep up
D. pull up

网友回答

A. pile up
(答案→)B. build up
C. keep up
D. pull up
解析：　 build up(=accumulate) 积累。pile up 堆积。keep up 保持，维持。 pull up 停车。
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