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 experts ______ on the cause of poverty but agree on steps to eradicate it.
A．differ
B．distinguish
C．dissent
D．object
单项选择题
Body paint is used mostly by men in preliterate societies in order to attract good health or to bad luck.
A．set back
B．ward off
C．shrug off
D．give away
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