单项选择题

In the second paragraph the word "paramagnetic" means ______.

A．slightly magnetic
B．a weak magnetic field
C．a strong magnetic substance
D．the under-water magnetic power
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单项选择题
We understand from the passage that the United States ______.
A．is rich in low-grade aluminum-bearing ores
B．is short of aluminum-making techniques
C．has to import ninety percent of its annual need of aluminum
D．has to produce fifty percent of the world's supply to meet its annual aluminum demand
单项选择题
It is believed that a new technique to ______ will probably be found.
A．recycle old aluminum products
B．discover more bauxite ores
C．make aluminum by putting ore particles under water
D．take out aluminum magnetically from poorer ores
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