防腐剂过量属于食品污染的()。
A、化学性污染
B、保鲜产生的污染
C、物理性污染
参考答案:A
By the time I pay off all the money that I borrowed from the bank when I bought my house, I will have been ________.
A.in debt
B.into debt
C.off debt
D.out of debt.
(10张家界13)、现有一瓶蒸馏水和一瓶稀盐酸,能将它们区别开来的试剂是( )
A.石蕊溶液
B.氯化钡溶液
C.酚酞溶液
D.氢氧化钠溶液