在X线片上显示为灰黑色和深黑色（）在X线片上显示为白色（）
A.骨骼和钙化
B.肌肉和内脏
C.结缔组织
D.软骨
E.脂肪和气体
参考答案：E,A
______ the programme, they have to stay there for another two weeks. [ ]
A. Not completing
B. Not completed
C. Not having completed
D. Having not completed
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