备洞时洞侧壁的釉质壁必须与釉柱的方向（）
A.呈75°
B.垂直
C.平行
D.呈30°
E.呈60°
参考答案：C
戈尔巴乔夫推行政治改革所造成的直接后果是[ ]
A、党内斗争日益尖锐
B、苏联经济大滑坡
C、出现多党制，国家权力分散
D、民族矛盾日益尖锐
It is _____ that she helped others with their lessons after school.[ ]
B. worthy of being praised
C. worth praised
D. worthy to praise
