问题
ear, the coal workers theirlungs X-rayed to ensure their health
A:they have to watch out for possibleattacks
B:their brain hemispheres take turns torest
C:the two halves of their brain aredifferently structured
D:the; a
B:their brain hemispheres take turns torest
C:the two halves of their brain aredifferently structured
D:the; a
正确答案是：
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