Tg在人体内的正常来源是（）。
A.肝脏
B.胰腺
C.甲状腺
D.肾上腺
E.脾脏
参考答案：C
To understand the grammar of the sentence, you must break it __________ into parts. [ ]
A. down
B. up
C. off
D. out
质量管理
