问答题

By 'human intervention'(Para. 2), the author refers to
A.the reduction of great energy waste in the environment.
B.the grasping of straightforward opportunities available.
C.acts like turning off lights when no one is in the room.
D.the adoption of smart sensing and network technology.

A.the
B.
B.the
C.
C.acts
D.
D.the
E.
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