单项选择题

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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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
单项选择题
Compound microscopes have two separate lenses or sets of lenses.
A．split
B．equal
C．detachable
D．distinct
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