结核病治疗为什么要早期用药？
参考答案：
①早期病灶内结核分枝杆菌生长旺盛，对药物敏感。
②同时病灶血液供应丰富、药物易于渗入病灶内，故早期用药疗效较好。
"Are you _____ from America?" "No, neither of us." [ ]
A. each
B. both
C. all
D. neither
How many nationalities _____ our country _____? [ ]
A. is; consisted of
B. does; make up
C. is; made from
D. does; consist of
