阻止口咽癌局部扩展的天然屏障是什么（）
A、硬腭
B、软腭
C、会厌
D、舌根
E、悬雍垂
参考答案：A
In the dark forests ______, some large enough to hold several English towns. [ ]
A. stand many lakes
B. lie many lakes
C. many lakes lie
D. many lakes stand
已知
+x＝-3，则x5+
的值是( )．
A．(322
B．(-123
C．(123
D．(-223
E．(A、B、C、D都不正确
+x＝-3，则x5+
的值是( )．