Radium salts，which have been found to ______ in bones，give rise to bone cancer.
A．pile up　B．build upC．keep up　D．pull up
B
考查短語辨析。build up(="accumulate)" 積累。pile up 堆積。keep up 保持，維持。 pull up 停車。根據(jù)句意選B。
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