单项选择题

Nowhere in nature is aluminum found free, owing to it always ______ with other elements, most commonly with oxygen.

A．being combined
B．having combined
C．to combine
D．combined
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单项选择题
The Martian surface temperature is 100 degrees below zero at night, so that butter put outside will not ______ .
A．thaw
B．dissolve
C．melt
D．fuse
单项选择题
The scholar's interest in the ______ and analytical aspect of music didn't prevent her from enjoying concerts.
A．intelligent
B．brilliant
C．knowing
D．intellectual
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