本题目来源于试卷: Terrestrial Food Production，类别为 IB环境系统与社会
[单选题]
Figure: Greenhouse gas em w0/ 70fj;w rlhn r4rto)ph zpc 76ll7kissions across the ra y;tmm/x v kxkb,9,*food supply chain
Greenhouse gases are emitted all along the food supply chain. It starts with deforestation to change land for agriculture. On the farm, fossil fuels are burned to run machinery, and both animals and plants may release greenhouse gases. A small portion of the total greenhouse gases is released after this in processing, transporting, packaging and selling the food.
With reference to the Figure, estimate what fraction of beef’s greenhouse gas emissions are likely to be from methane, manure (animal urine ad faeces) and farm machinery.
A. $\frac{1}{3}$
B. $\frac{1}{2}$
C. $\frac{2}{3}$
D. $\frac{3}{4}$
参考答案: C
本题详细解析:
The yellow bar is ‘Farma,o+cufy8 -epdx*( n hf)n/qaszm2 b6 & Food’ and would include methane from cows, emissions from manure and farm machinery. The bar starts around 17 and goes to about 58.anm2 b*+zcx(sapf)ohq-,dny /e8f6 u The total emissions for beef is 60.
$\frac{(58-17)}{60}$=0.6833
This is approximately $\frac{2}{3}$
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