单项选择题

The leaves of the eucalyptus tree can be used to make a potent antiseptic that kills harmful bacteria in cuts and scrapes.

A. natural
B. dangerous
C. rare
D. tropical
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Ammonia, one of the earliest known nitrogen compounds, was originally produced by distilling organic materials.
A. masses
B. fabrics
C. substances
D. liquids
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The climate and soil as far north as the Arctic Circle permit farmers to raise livestock and grow barley, potatoes and other crops.
A. help
B. allow
C. require
D. expect
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