净制龟甲的方法是（）
A.去头尾
B.去残肉
C.去皮骨
D.去芦
E.去心
参考答案：B
—________, David? You don't look well.
—I have a fever and I feel tired.[ ]
A. What are you
B. What's the matter
C. What's the wrong
D. What's that
用于回购的人民币债券包括国债、中央银行票据、政策性金融债以及企业债券。( )
