分解因式：a﹣ab2的结果是[ ]
A．a（1+b）（1﹣b）
B．a（1+b）2
C．a（1﹣b）2
D．（1﹣b）（1+b）
答案：A
机体初次感染结核菌到产生迟发型变态反应之间，一般需要（）
A.12～24小时
B.24～48小时
C.48～72小时
D.1～4周
E.4～8周
About five ____ people watched the Olympic Games in 2008, and _____ of them were from
foreign countries. [ ]
A. million; two million
B. millions; two millions
C. million; two millions
D. millions; two million
