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．He drives too fast.B．He plays his guitar too loudly.C．His radio wakes her children up.D．His friends are too noisy.
A．He drives too fast.
B．He plays his guitar too loudly.
C．His radio wakes her children up.
D．His friends are too noisy.
单项选择题
A．To increase product sales.B．To make a product much better.C．To spend more money.D．To reduce the production.
A．To increase product sales.
B．To make a product much better.
C．To spend more money.
D．To reduce the production.
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