承兑制度适用于()
A.汇票
B.本票
C.支票
D.以上都对
参考答案:A
Later, these rocks proved that ___ in the distant past the Antarctic was covered by plants.
A.at one time
B.at a time
C.at times
D.at the same time
儿童在5岁以后才认识到性别的稳定性特征。