幼儿游戏
参考答案：
是幼儿喜爱的、主动的活动，是幼儿反映现实生活的活动，这种活动具有主动性、社会性、非生产性、愉悦性的特点
The secretary________letters all the afternoon and there are still two letters to finish.[ ]
A. is typing
B. had type
C. has been typed
D. has been typing
调查研究的步骤有哪些？
