49. According to the passage, which of the following is an example of “handprints”?
(A) Cutting down trees for firewood.
(B) Tossing plastic bags into trash cans.
(C) Calculating calories of your dinner.
(D) Printing your term paper double-sided.

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統計: A(4), B(1), C(7), D(33), E(0) #568683