预防肠道传染病应采取的是主要环节的综合措施是()。
A.治疗病人
B.隔离带菌者
C.切断传播途径
D.预防接种
E.留验
参考答案:C
I won't pay $ 200 for this article, it's not worth ( ).
A.all that much
B.that all much
C.that much all
D.much all that
影响学前儿童健康的因素有哪些?