They are the same size. You can take half of the bread.
A. in, either
B. with, either
C. in, both
D. at, none
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(答案→)A. in, either
B. with, either
C. in, both
D. at, none
解析：介词辨析。In在……里面；with伴随，和；at在时间空间的一点；either两个中的任何一个；both两者都；none没有一个。句意：他们是一个尺寸。你可以拿任何一半面包。结合语境可知选A。