分析肉类腌制的方法。
参考答案：
（1）干腌法
（2）湿腌法
（3）混合腌制法
（4）注射腌制法
暴露生物学标志
Can you believe his reason for being absent from the class _____ he had to look after his sick mother at home?
A．while B．that C when D．as
