TPO-20-L-lecture2-Q15 - 英檢

Q:according to the professor, what activities associated with the beginning
of agriculture may have slowed or prevented the onset of predicted ice age?2ANS

A. the clearing of trees
B. the burning of fossil fuels
C. the domestication of certain animals
D. the cultivation of certain grains


答案是AC
但不知道D為什麼錯

內文有說到certain grains 是導致methane 變多的原因 應該也屬於溫室氣體吧?

原文相關段落:
Well, one of the big differences is human activity. People began to raise
crops and animals for
food instead of hunting for them. This is the agricultural revolution. And it
began to happen in the earliest stages about 11 thousand years ago.

Now, scientists have tended to regard ... the ... uh ... agricultural
revolution as a beneficiary of the ... uh ... fortuitous2 shift in climate.
However, some new theories of climate, new theorists of
climate have proposed that perhaps humanity was having an effect on the
climate as far back as the beginnings of the agricultural revolution.
When you grow crops and uh, pasture your animals, one of the things you do is
you cut down the forests. If you cut down the forests, when you burn
the trees for fuel and don’t replace them with other trees, or when you just
leave them to rotand don’t allow other trees to grow,
you end up with a lot more carbon in the form of carbon
dioxide getting into the atmosphere.

Um ... another gas associated with the spread of agriculture is methane.
Methane forms in large concentration above wetlands, and as it turns out,
the cultivation of certain grains creates vast
areas of artificial wetlands, and probably drastically increases the amount
of methane getting into the atmosphere, over and above what would be there.

不好意思不會用顏色把主要句子標出來><"

還請大家幫忙^^

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