单项选择题

When we were about to get away a police car came to the front door.

A．当我们正要离开的时候，一辆警车来到了前门。
B．我们正准备离开，一辆警车来到前门。
C．当我们正要逃跑的时候，一辆警车来到了前门。
D．当我们大约要走的时候，一辆警车来到了前门。
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单项选择题
The experiment with the dove indicated that ______.
A．birds have to be taught to navigate
B．a bird that has been caged will not fly long distances
C．some birds cannot fly at night
D．some birds seem to follow the stars when they fly at night
单项选择题
In total darkness, doves ______.
A．use landmarks
B．don't know which way to fly
C．fly back home
D．wait for the stars to appear
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