A．someone spilled water on it.
B．someone lost it.
C．it was made of low quality metal.
D．the standard for measuring had changed.
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A．It is a small amount to pay for so much precious metal.
B．It is difficult to judge the value of such an object.
C．It is reasonable for an object with such an important function.
D．It is too high for such a light weight.
A．Selling and buying.
B．What is the market?
C．Everything you do is producing for the market.
D．What the market can do for you?
A．working in a bank.
B．looking after the other's babies.
C．attending a night school.
D．growing beans for sale.