社会学研究的（）特点充分表现在它对社会调查的重视上。
A.整体性
B.系统性
C.综合性
D.实证性
参考答案：D
无菌药品生产，必要时，应当（）制药用水的细菌内毒素，保存（）及所采取（）的相关记录。
E-mail, as well as telephones, ______ an important part in our daily life. [ ]
A. is playing
B. play
C. are playing
D. have played
