单项选择题

It can be inferred from the passage that during the past fifty years the demand for magnesium has（）

A．declined greatly
B．remained stable
C．increased slightly
D．risen dramatically

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单项选择题
According to the passage, why is magnesium important to industry（）

A．It is strong.
B．It conducts heat well.
C．It weighs little.
D．It is inexpensive to produce.
单项选择题
55（）

A．pushing
B．pulling
C．milling
D．carrying
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