对一个玩具,儿童既可按颜色归类,也可按形状归类,还可以按大小归类,说明这时儿童的认知水平已达到()。
A.感知运动阶段
B.前运算阶段
C.具体运算阶段
D.形式运算阶段
参考答案:C
Tom didn't pass the exam, His mother is _____ about . [ ]
A. worry
B. worried
C. worries
D. worrying
101,103,106,110,115, _________ ( )
A.122
B.120
C.121
D.118