题目

美国南北战争的根源是（    ）   A.反对林肯当选总统              B.两种经济制度的矛盾   C.向西部领土移民                D.南方种植园主的叛乱 答案：B按正确的顺序重新排列下列句子，将句子前的字母输入横线即可 A What a nice day they have! B Others can have a picnic with their parents in the park. C Today is Sunday. D Some can play computer games at home. E The children are very happy because they have no lessons.