《中华人民共和国邮政法》规定用户交寄给据邮件后,对国内邮件可以自交寄之日起()持收据向邮政企业查询。
A、一个月内
B、三个月内
C、半年内
D、一年内
参考答案:D
叶酸的拮抗剂是()
A.次黄嘌呤
B.胸腺嘧啶核苷
C.胸腺嘧啶核苷激酶
D.氨基蝶呤
E.次黄嘌呤核糖转化酶
She with him because he was late again. [ ]
A. annoyed
B. annoying
C. is annoying
D. is annoyed