自然人之间的借款合同，其生效时间是（）。
A.第一次支付利息时
B.签订借款合同时
C.贷款人提供借款时
D.口头达成协议时
参考答案：C
The teacher used to stay up deep into the night.________, he made himself ill. [ ]
A. However
B. Eventually
C. Moreover
D. Also
流动性偏好可以很好的解释反向收益率曲线。( )
