巨大气瘿压迫气管时的主要症状是
A．咳嗽
B．胸痛
C．呼吸困难
D．发热
E．血痰
参考答案：C
Alice's father always brings her a nice gift _____ he returns home from his business trip. [ ]
A. by the time
B. at the time
C. every time
D. in the time
《中药品种保护条例》保护对象包括______
A．中成药 B．天然药物提取物C．中药人工制成品 D．天然药物制剂E．以上均是
