0不是自然数。[ ]
错误
The girl glanced over her shoulder and found herself ______ by a young man in black. [ ]
A. was followed
B. followed
C. following
D. had been followed
清热药不具有的功效是
A.清热泻火
B.清热燥湿
C.清热镇痉
D.清热凉血
E.清虚热