i 语言知识及应用( 共两节，满分45分）
第一节 完形填空 (共15小题；每小题2分，满分30分)
阅读下面短文，掌握其大意，然后从1—15各题所给的a、b、c和d项中，选出最佳选项，并在答题卡上将该项涂黑。
my father grew up in oklahoma during the early years of the great depression. he was the only living child of a hardworking farmer and a__1__mother.when dad completed eighth grade, my grandfather believed his only son would work on the farm. my grandmother，however，understood the door that education could open even in__2__economic times. she persuaded grandfather to__3__dad t
