题目内容:
Itisimpliedbutnotstatedinthepassagethat( )o A.therewasashortageofworkersonAmericanfarms
B.themostimportantoftheearlyinventionwastheironplow
C.after1869,manypeopledevotedtheirattentiontotheplow
D.CharlesNewbolthadmadeafortunebyhiscast-ironplow
参考答案:
答案解析: