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

正确答案是：

同类题型

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正确答案网

ear, the coal workers theirlungs X-rayed to ensure their health