单项选择题

Nowhere in nature is aluminum found free, owing to its always () with other elements, most commonly with oxygen.

A. combined
B. having combined
C. combine
D. being combined

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单项选择题
When people become unemployed, it is ()often worse than lack of wages.

A. laziness
B. poverty
C. idleness
D. inability
单项选择题
In previous times, when fresh meat was in short(), pigeons were kept by many households as a source of food.

A. store
B. provision
C. reserve
D. supply
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