单项选择题

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单项选择题
A. How to care for precious metals. B. A standard unit for measuring weight. C. The value of precious metals.D. Using the metric system.
A. How to care for precious metals. B. A standard unit for measuring weight.
C. The value of precious metals.D. Using the metric system.
单项选择题
A. 4 children. B. 4.2 children.C. 2.4 children. D. 2 children.
A. 4 children.
B. 4.2 children.
C. 2.4 children.
D. 2 children.
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