一次聚会中，有10人参加，如果每两个人都握手一次，共握多少次手（ ） [ ]
A．46
B．45
C．47
D．44
答案：B
I won't pay $20 for the coat; it's not worth _______. [ ]
A. all that much
B. that much all
C. that all much
D. much all that
麻疹的病因是( )
A．腺病毒B．溶血性链球菌C．风疹病毒D．水痘一带状疱疹病毒E．麻疹病毒
