I have a new skirt ________ my birthday party.[ ]
A. on
B. to
C. for
答案：C
— Has the little girl passed ______ P.E．test?
— She has tried twice, and the teacher will allow her to have _____ third try.
A．the; 不填
B．a; the
C．the; a
D．the; the
预防亚硝胺污染食品的措施主要有______。
A．防止食品霉变
B．防止细菌将硝酸盐转变为亚硝酸盐
C．控制肉制品加工中的硝酸盐使用剂量
D．加强环境治理
