单项选择题

"Good" (Para. 3, Line 1) refers to the ants'______.

A．co-operation in working
B．sense of responsibility
C．efficiency in working
D．willingness to work hard
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单项选择题
The scientist's work was based on______.
A．occasional observations
B．systematic observations
C．observations of several nests
D．observations of an undisturbed nest
单项选择题
What is the most suitable word that describes the work of a policeman according to the passage
A．Dangerous.
B．Demanding.
C．Distressing.
D．Dramatic.
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