6个月小儿能（）
A．独立，扶住一只手可行走
B．开始无意识呀呀发出单音
C．能翻身
D．扶着栏杆站立
E．懂比较复杂的词意
参考答案：B, C
采用闭式喷头的湿式自动喷水灭火系统每个报警阀控制喷头数不宜超过（）个。
A．1000
B．1200
C．800
D．600
— Is Lucy or Lily the ______ of the twins?
— Lucy. She was born half an hour earlier. [ ]
A. younger
B. youngest
C. elder
D. eldest
