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【单选题】
心理学家提出0-7岁儿童身心发展中存在许多“关键期”，其中（）是掌握数概念的关键期。A.
2-3岁
B.
3-4岁
C.
5岁
D.
6岁
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A.
than
B.
when
C.
as
D.
after
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【单选题】下列关于我国计算利息传统标准的说法，不正确的是（ ）。
A.
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B.
每l0毫为l分
C.
月息几厘用千分之几表示
D.
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A.
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B.
kind of
C.
in the form of
D.
but then
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