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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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
单项选择题
Unlike gases, liquids are difficult to compress because there is practically no free space between molecules.
A．In contrast to
B．Similar to
C．More to
D．Just as
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