优先股与公司债的主要区别在于不退股。（）
参考答案：对
素有“欧洲的牧场和食品库”之称的国家是
A．法国
B．英国
C．挪威
D．丹麦
It was very cold ____ they still went swimming.
A．although
B．but
C．however
D．though
