伤寒病人进行粪便培养致病菌的最佳时间是（）
A.潜伏期末
B.发病1～4天
C.发病5～10天
D.发病2～3周
E.发病4周后
参考答案：D
联合国安全理事会五个常任理事国是________、美国、________、英国和法国。
His money is ______ mine . [ ]
A. twice more than
B. more than twice
C. more twice than
D. two times more than
