哪种情况可引起全身淋巴结肿大（）
A.急性咽炎
B.慢性鼻炎
C.再生障碍性贫血
D.链霉素过敏
E.足癣合并感染
参考答案：D
He doesn't do his homework _______. So he always makes some mistakes. [ ]
A. careful enough
B. enough careful
C. carefully enough
D. enough carefully
流行性腮腺炎主要的传染源是（）。
A．早期患儿和隐性感染者
B．恢复期患儿
C．慢性带菌者
D．猩红热患儿
E．猩红热患儿和带菌者
