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.
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单项选择题
A．Jack and his wife are still on friendly terms.B．Jack and his wife are teaching each other.C．Jack and his wife used to love each other.D．Jack and his wife won’’t have a divorce.
A．Jack and his wife are still on friendly terms.
B．Jack and his wife are teaching each other.
C．Jack and his wife used to love each other.
D．Jack and his wife won’’t have a divorce.
单项选择题
Such tricks as rob banks, or solicit bribes, or establish a monopoly account for the root cause of variation in income.
A．Y
B．N
C．NG
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