单项选择题

Which of the following is the energy group NOT required to do

A．Research on alternative energy sources.
B．Study alternate-fuel transit systems.
C．Deal with energy waste.
D．Make two pieces of solar equipment.
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Which group is responsible for the alternative healing systems
A．The energy group.
B．The shelter group.
C．The health and medicine group.
D．The water group.
单项选择题
What is the main topic of this passage
A．The gathering of a film club.
B．The study of the elements of a petroleum-free community.
C．The division of labour among the members of a community.
D．The research program of alternate energy sources.
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