She doesn't know how to her naughty children.[ ]
A. manage
B. serve
C. love
D. do
答案:A
Nowadays some protective parents want to________their kids from every kind of danger, real
or imagined.[ ]
A. spot
B. dismiss
C. shelter
D. distinguish
拉伸管材时出现较多的断头,主要原因有哪些?