8 According to people who study ecology, human beings need to find new sources of energy that will .
(A) destroy the environment
(B) protect the planet we live on
(C) change the geography of the earth
(D) help us go to other planets

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統計： A(83), B(871), C(78), D(89), E(0) #248644

All pass

B1 · 2015/08/14

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developed. Otherscholars are deeply concerned about ecology and the kinds of energy we should use to protectthe environment in the future.