封闭型基金指基金发行的股份相对固定，一般不向投资者增发新股或赎回旧股，但投资者可以将基金股份在______按市场价格买卖的投资基金。
参考答案：二级市场
83+79+85+83+82+77+80．
Network managers have long (140) practical voice-over-IP (VOIP) solutions. VOIP (141) ease network management and decreases costs by converging a company’s telephony and data infrastructures into one network. And a VOIP solution implemented at a company’s head-quarters with far-reaching branch offices can (142) tremendous amounts of (143) in long distance phone bills, provided that solution delivers POTS-like voice (144) over the Internet.
A．frequency
B．length
C．quality
D．quantity
