若 2·8n·16n=222,求正整数m的值.
n=3
John's success has nothing to do with good luck. It is years of hard work ________ has made him
what he is today. [ ]
A. why
B. when
C. which
D. that
对学生的希望可以使教师产生对教育工作高涨的热情和浓厚的兴趣。