后颅窝占位病变可引起下列哪种()
A.幕下疝
B.钩回疝
C.小脑扁桃体疝
D.海马回疝
E.扣带回疝
参考答案：C
The little girl eats chcolates. She thinks they are bad for her teeth.
A．almost
B．already
C．nearly
D．hardly
（）是气流分布和产量影响最大的调剂。
