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
The best title for this selection is ______.
A．An Ear for Music
B．Music Appreciation
C．How Muscles Participate in Mental Acts
D．A Psychological Definition of the Thinking Process
单项选择题
The passage focuses on ______.
A．construction and manufacturing industry in the United States
B．new technique of obtaining aluminum from poor ores
C．consumption and production of aluminum in the United States
D．the annual import of high-grade aluminum into the United States
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