公共关系的手段是（）。
A.信息传播
B.行政命令
C.经济制裁
D.物质引诱
参考答案：A
It ___________ that he has been ill for a long time. [ ]
A. seems
B. looks
C. looks as if
D. seems as if
活跃期最大时限（）
A.8小时
B.16小时
C.24小时
D.3小时
E.4小时
