祖冲之最突出的成就是 [ ]
A、求得比较精确的圆周率
B、测算出一年的时间
C、造出千里船
D、设计制造水碓磨
A
—He got his first book published. It turned out to be a bestseller.
—When was ________?
— ________ was in 2000 when he was still in college.
A．that; This
B．this; It
C．it; This
D．that; It
在五笔字型中，主要是将汉字（）
A.拼音
B.分解
C.组合
D.分类
