填空题 A The blues is an emotional song
B The officer was good for nothing
C "the prisoners' songs differed from those on tapes, sung at concerts and jazz sessions"
D They identified themselves with its singers
E Could come close to the poor and the weak
F It was sung in their native language

填空题 The writer compares an officer to a car radiator cap to show that ______.

填空题 Being an infantry soldier, the writer ______.

填空题 The soldiers enjoyed the prisoners' song because ______.

填空题 The sentence "none of them was like this" means ______.