前民主德国实行（）的住房保障模式。
参考答案：福利政策为主
Are there______ books in the bag? No, There aren't _____ books in it, but there are_____ pens in it. [ ]
A. any, any, some
B. any, some, any
C. some, any, any
补充饮用水应注意（）。
A、让幼儿抬水
B、让幼儿旁观
C、避开幼儿
D、放在幼儿活动区
