城市景观是什么最为明显的景观类型。()
A.人为干扰
B.自然干扰
C.物质生产最高
D.系统最为稳定
参考答案:A
--- does your sister go skateboarding?
--- Every day.
A.How long
B.How many
C.How much
D.How often
背对背信用证开立后,原证即失去效用。