混凝土的灌注宜先从（）开始，以使挂篮的微小变形大部分实现，从而避免新、旧混凝土间产生裂缝。
参考答案：挂篮前端
There _______ great changes in our hometown over the twenty years. [ ]
A. have taken place
B. have had
C. have been
D. were
温针灸法时装置艾绒之处（）。
A.针尖
B.针身
C.针根
D.针柄
E.针尾
