已知二次函数y=mx2+x+m(m-2)的图象经过原点，则m的值为[ ]
A． 0或2
B． 0
C． 2
D．无法确定
答案：C
—Were you often late for school last term, Tom?
—_____. I got to school early every day.[ ]
A. Always
B. Usually
C. Sometimes
D. Never
下列哪些海船船员培训合格证书是长期有效的。（）
A、高级消防培训合格证
B、精通急救培训合格证
C、保安意识培训合格证
D、船舶保安员培训合格证
E、油船和化学品船货物操作基本培训合格证
for school last term, Tom?