It seems that smaller ants perform more of the _______.

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.

A．New kind of desks and chairs should be made.
B．Many companies are trying to improve the working settings for their employees.
C．Classroom interaction between students is essential to the training of critical thinking.
D．A comfortable environment leads to higher working efficiency.