What do you usually do for your mother _____ Mother'S Day? [ ]
A. of
B. to
C. in
D. on
答案:D
通过小额支付系统办理公用事业收费业务的发票如何传递?
鸡冠花移苗时需带土坨,否则()长。
A.生长期
B.缓苗期
C.开花期
D.结果期