下图是北半球中高纬环流示意图，下列说法正确的是
A．①是西风带
B．②是温和湿润的气流
C．甲点位于90oN
D．乙点位于30oN
答案：A
( )是商业银行证券投资的主要对象。
A．国债B．金融债券C．中央银行票据D．资产支挣证券
—Did you go to Nancy's birthday party last night?
—Yes. I did. _______. [ ]
A. So did Tim
B. So Tim did
C. Tim did so
D. Tim went so
