课程改革是我国教育领域的一场广泛深入的教育（）。
A.改革
B.创新
C.变革
参考答案：B
We knew he was very sad from the _____ on his face when hearing the news. [ ]
A. looking
B. appearance
C. expression
D. attitude
建设单位必须保存设备开箱检验记录。
