单项选择题

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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单项选择题
A．The growing work force provides it with more workers.B．The government taxes it lighter than before.C．Many people no longer cook at home.D．Highly educated work force improves its work efficiency.
A．The growing work force provides it with more workers.
B．The government taxes it lighter than before.
C．Many people no longer cook at home.
D．Highly educated work force improves its work efficiency.
单项选择题
A．200, 000 tons.B．2 million tons.C．20 million tons.D．2,000 tons.
A．200, 000 tons.
B．2 million tons.
C．20 million tons.
D．2,000 tons.
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