可待因主要用于：
A．上呼吸道引起急性咳嗽B．多痰、粘痰引起的剧咳C．剧烈的刺激性干咳D．肺炎引起的咳嗽E．支气管哮喘
参考答案：C
头颅平面摄片应
A．平静呼吸下屏气B．深吸气后屏气C．深吸气再呼出后屏气D．平静呼吸不屏气E．缓慢连续呼吸
In that month, he earned as much as, if ____ than, $40 000.
A．no more
B．not more
C．no much
D．not much
