It is said that our body 206 bones; if one of is broken, it will cause inconvenience of some kind.
A. makes up of; them
B. is made up of; them
C. is made up of; which
D. makes up; which
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A. makes up of; them
(答案→)B. is made up of; them
C. is made up of; which
D. makes up; which
解析：考查短语及代词。be made up of 由……组成；make up组成。them为代词，指代206 bones。故选B。