据图回答下列问题:
据图1可知,生长素可作为除草剂灭草的原理是使杂草的生长素浓度处于()状态下
参考答案:大于i
美国对货运代理行业及无船承运人(NVOCC)实行营业许可管理制度,从事货运代理及无船承运业务的企业,必须进行注册登记,并需交纳一定的保证金。因此,我国企业若在美国从事国际货运代理业务或无船承运业务,按规定应提供()美元的保证金。
A.20万
B.15万
C.10万
D.5万
His ______ behavior made everyone nervous. He was always rushing to open doors and perform other small tasks, apologizing unnecessarily for any inconvenience that he might have caused.
A.oblivious
B.observant
C.obsequious
D.obsolescent