五化三园
参考答案：
五化指：规划、硬化、绿化、美化、文化；三园指：花园、学园、乐园。
Great changes ______ in China in the past 20 years.
[ ]
A. took place
B. have taken place
C. were taken place
D. have been taken place
新生儿期是（）。
A.4～6岁
B.1～3岁
C.7～12岁
D.出生至1周岁
E.出生至28d
