单项选择题
A.45B.55C.50D.35
A.1032B.1332C.1000D.998
A.20人B.16人C.10人D.8人
A.0B.1C.2D.3
A.30.6%B.30%C.29.6%D.29.1%
A.3B.5C.6D.8
A.120B.130C.150D.160
A.482B.492C.502D.512
A.20B.40C.80D.93
A.20B.25C.30D.35
A.160B.171.2C.172.8D.184