预防食物中毒的措施包括防止食品污染、控制( )和彻底消灭病原体。
A．消毒次数
B．细菌繁殖
C．加热过度
D．污水排放
参考答案：B
肝的功能是（）
A．主气
B．主血脉
C．统血
D．纳气
E．藏血
______we were worried about was ________they could manage to control the pollution.
A．That how
B．That whether
C．What that
D．What whether
