What does the author mean by “moms-to-be” in the last paragraph?
A.Women who are pregnant, especially for the first time.
B.Women who dream of having babies for the first time.
C.Women who already have children.
D.Women who have just got babies for the first time.
第3题
食用存放过久或变质的蔬菜,()含量增加,易引起食物中毒。
A.细菌性
B.有毒金属
C.亚硝胺
D.亚硝酸盐
第4题
腐烂的蔬菜最易形成(),因此剩菜不要存放过久,尤其是绿叶菜。
A.硝酸盐
B.亚硝酸
C.亚硝酸盐
D.亚硫酸盐
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