A:用地紧张
B:环境污染严重
C:人口老龄化
D:资源日益枯竭
①只凭巧手煮清羹,厨中妙手调美味 ②粒米皆从辛苦得,寸薪不是等闲来
③汉石周金鸿文永宝,林风山月雅兴长留 ④江山万里如画,神州四时皆春
⑤菱花光映纱窗晓,杨柳春风拥画图 ⑥窗前草色侵吟席,帘外花香入睡轩
—You'd better ______ first. I'm afraid the size is a bit small for you.
(Ⅰ) EF∥平面A1BC1;
(Ⅱ) 平面AEF⊥平面BCC1B1.