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【单选题】
随着儿童年龄的增长，他们能逐渐接受别人的意见，并获得长度、体积、面积和重量的守恒概念。这表明儿童已经达到了认知发展阶段的（ ）。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
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反馈参考答案：
举一反三
【单选题】His job is to sell the ____ carvings in the ____ department of the company.
A.
wooden; sales
B.
wood; sales
C.
wood; sale
D.
wooden; sale
【单选题】It's no use the Minister trying to ( ) his department's mistakes.
A.
turn up
B.
gloss over
C.
roo out
D.
set up
【单选题】下列关于统筹账户与个人账户基金区别的说法不正确的是( )
A.
社会统筹基金多为长期资金，要求流动性低
B.
个人账户依靠投资分散化来化解风险
C.
社会统筹基金实行现收现付制度
D.
个人账户基金属于被保险人个人所有
【单选题】The boss ____department his brother worked called at the hospital yesterday afternoon, for his brother was injured．
A.
in which
B.
whose
C.
which
D.
in whose
【简答题】The director required that every member in his department (refer) ______ to his report.
【简答题】A．His body's resistance was low and he went to big department store. B．He was overtired and didn't eat nutritious food. C．He was stressed out because he had to decide which gift to buy. D．He had to ru...
【单选题】d是Z2上序列α=a0a1......an-1的一个周期的充要条件是什么?
A.
α的初始值组成的列向量是单位向量
B.
α的初始值组成的列向量是Ad的属于特征值为1的一个特征向量
C.
α的初始值组成的列向量是零向量
D.
α的初始值组成的列向量是Ad的属于特征值为n的一个特征向量
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