桡骨远端骨化中心出现的时间（）
A.4周
B.8周
C.6个月
D.12个月
E.1岁半
参考答案：E
美术颜料的三原色是红色、______色和蓝色．
_____ fashions differ from country to country may reflect the culture difference from one aspect.
[ ]
A. What
B. That
C. This
D. Which
