女性肿瘤性腹腔积液常见于（）。
A.卵巢癌
B.肝癌
C.胆囊癌
D.乳腺癌
E.胆管癌
参考答案：A
—You ought to have made an apology to Tom yesterday evening．
—Yes, I know I __ __．
A．ought to have
B．have to
C．should
D．must have
试述收听率调查在美国兴起的主要原因
