Kate knew nothing _______ her mother told her.
A：because
B：until
C：since
D：if
一____桃 一____凉棚 一____葡萄
一____碉堡 一____梯田 一____城市
— I exercise three times a week.
砖与陶瓷的生产都需要消耗大量的黏土、煤、和其他燃料，会对环境产生影响。（ ）
