28) What is the main idea of this passage?
A)
In order to help preserve and protect our
environment, builders should construct more "green"
buildings.
B)
One way a building can be more green is by the use
of passive solar heating to decrese the use of
electricity
Reducing the amount of fresh water used in building
is another way that builders can help protect the
environment.
C)
D)
One way a building could be more green is through
the use of green roofs and walls to reduce heating
and cooling costs.