简述全冠的种类。
参考答案：
全冠的种类有：①金属全冠，铸造全冠和锤造全冠；②非金属全冠，塑料全冠和烤瓷全冠；③金属与非金属联合全冠。
-- I have learned that your husband’s family has a lot of money.
-- ___________? I have never relied on him.
A．What for
B．What if
C．So what
D．How come
已知不等式 loga（a2+1）＜loga2a＜0，则a的取值范围是______．
