单项选择题

It will rain, ______ the barometer is falling.

A．so
B．for
C．as
D．since
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单项选择题
Paul was lying on the lawn, his hands ______ under his head.
A．were crossing
B．were crossed
C．crossing
D．crossed
单项选择题
When our university laboratory bought this microscope we were given a one year's
A．reservation
B．security
C．proof
D．guarantee
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