预防肠道传染病的最重要的措施是
A．隔离治疗病人
B．隔离治疗带菌者
C．切断传播途径
D．疫苗预防接种
E．接触者预防服药
参考答案：C
My sister ______ music. She sings very well. [ ]
A. is good at
B. is good for
C. does well at
D. does badly in
果树的休眠
