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
考查短语辨析。build up(="accumulate)" 积累。pile up 堆积。keep up 保持,维持。 pull up 停车。根据句意选B。
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