婴幼儿上颌骨骨髓炎的感染途径主要是（）
A.血源性感染
B.外伤性感染
C.牙源性感染
D.腺源性感染
E.接触性感染
参考答案：A, B, E
I’ll talk about a newly-opened market ______ you may get all _______ you need.
A．in which; which
B．where; that
C．where; what
D．which; that
寒滞肝脉证的临床特征是（）
A.头晕目眩，胸胁胀闷
B.少腹冷痛，睾丸坠胀
C.阴囊湿疹，外阴瘙痒
D.胁肋冷痛，得温则减
E.形寒肢冷，舌淡脉弦
