单项选择题
Generally speaking，the British Parliament operates on a （）system.
A.single-partyB.two-partyC.three-partyD.multi-party
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 （）
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。 ()
