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

 B


解析:

build up(=accumulate) 積累。pile up 堆積。keep up 保持，維持。 pull up 停車。

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

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

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