单项选择题
The U.S.lies in （）North America，with Canada to the north，Mexico to the south，the Atlantic to its （）and the Pacific to its （）
A.northern，east，westB.central，east，westC.southern，west，eastD.western，east，west
单项选择题 The state of （）is the largest in area of all the states.
判断题 控制论模式最大的贡献,是为传播过程添加了反馈机制。 ()
单项选择题 The polices of the Conservative Party are characterized by progmatism and （）
