Radium salts, which have been found to _____ in bones, give rise to cancers of t
题型：不详难度：来源：
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 |
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答案
| B |
解析
| build up(="accumulate)" 积累。pile up 堆积。keep up 保持，维持。 pull up 停车。 |
举一反三
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