单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．Typing an report.
B．Going to hospital.
C．Driving her car.
D．Buying some fruit.
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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
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
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