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