凯恩斯的流动性偏好论认为货币需求是由三个动机决定的，以下不属于这三个方面的是( )。
A．交易动机
B．预防动机
C．投机动机
D．流动性动机
参考答案：D
Through thorough investigation, Dr. John Snow was finally able to prove that the outbreak of Cholera _____ people’s drinking of polluted water. [ ]
A. was close linked with
B. closely linked to
C. was close connected with
D. was closely linked with
无输血史初产妇Rh(—)，第一胎发生胎儿溶血的原因是
A．肠道寄生虫感染B．注射伤寒疫苗、破伤风或白喉类毒素C．使用某些植物而被致敏D．该孕妇为胎儿时即被致敏E．大量胎儿红细胞通过胎盘进入母体循环
