单项选择题

It seems that smaller ants perform more of the _______.

A．construction tasks
B．domestic tasks
C．defensive work
D．heavy work
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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 undisturbed nests
单项选择题
Which of the following arrangements of the classroom can bring about the best teaching effect
A．Arranging the desks in straight rows and providing every minute for the students to listen to the teacher.
B．Breaking a class into small groups and letting the students find the group they prefer to stay in.
C．Putting the students in a larger class and allowing them to discuss.
D．Breaking a class into small groups and asking the students to stay in the fixed groups as the teacher arranges.
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