单项选择题

Scientists say that many factors ______ great changes in the weather.

A．brought about
B．brought on
C．brought up
D．brought forward
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单项选择题
In many areas, rapid development is the result of ______ in the research laboratory.
A．work to do
B．work done
C．doing work
D．work doing
单项选择题
At first ice cream was shaken by ______ hand in ______ pan of salt and ice.
A．a, the
B．the, a
C．/, a
D．the, the
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