Radium salts,which have been found to __
题型:选择题
问题:
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
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