题干
This is Jim Green. Jim is his name.
A：one
B：first
C：the first
D：the one
答案(点此获取答案解析）
B
This is Jim Green. Jim is his name.
A：one
B：first
C：the first
D：the one
…，利用你所发现的规律，那么 
的个位上的数字为（ ）
,向量
,则
的最大值为（ ）．