49. Which of the following is closest to the word “soot” in the fourth paragraph?
(A) Dust produced when branches are chopped.
(B) Liquid waste originated when coal is mined.
(C) Powders generated when coal or wood is burnt.
(D) Fumes exhaled when engines or motors are operating.

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統計: A(6), B(4), C(81), D(22), E(0) #840917

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#3307933
soot煤灰;煤煙;油煙(A) Dust...
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