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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

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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.

单项选择题In what way are the ants different from other non-human societies

A．They do not need to search for food.
B．They do not need to look for shelter.
C．Individuals vary in social status.
D．Individuals perform different functions.