天翼邮5元包月的邮箱容量是多少？（）
A.2G
B.10G
C.20G
D.不限容量
参考答案：B
烂疔的疼痛特点为（）
A.阵发性
B.持续性
C.烧灼性
D.胀裂性
E.鸡啄样
I know the number of people in this city ____ 550,000 and a number of them ____ from Asia. [ ]
A. are; are
B. is; is
C. is; are
D. are; is
