单项选择题

A．By doing homework.
B．By knowledge from books and parents.
C．By having pocket money from their parents.
D．By saving what they have.
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单项选择题
A．At a laboratory.B．In a classroom.C．At a bank.D．In a department store.
A．At a laboratory.
B．In a classroom.
C．At a bank.
D．In a department store.
单项选择题
Which of the following is NOT true about open-outcry trading
A．It is obsolete compared with electronic systems.
B．It concerns more about liquidity.
C．It is less costly than electronic systems.
D．It is impossible to be abolished entirely in a short term.
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