RC Drill Set 4, Question 13
Increases in the amount of carbon dioxide (CO2)(472 more words not shown)
The passage suggests that a(15 more words not shown)
- Aa natural climatic(1 more words not shown)
- Ban increase in(2 more words not shown)
- Ca 20 percent(7 more words not shown)
- Da decrease in(5 more words not shown)
- Ethe replacement of(5 more words not shown)
Reading the passage
My first thought is increased CO2, since the opening explains how greenhouse gases retain energy. But the question asks what a future temperature rise could result from, so we should also remember the uncertainty about the cause. We'll check which proposed possibility the writer actually entertains.
Working the answers
- ACorrect
Paragraph 2 asks whether a rise would be due to ordinary climatic variation or additional greenhouse gases (paragraph 2). Natural climatic variation is therefore an explicitly considered possibility, even though greenhouse gases were our first thought. We don't have to decide which explanation is right.
- B
The text discusses energy being prevented from escaping into space, not an increase in solar reradiation as a possible cause. Don't substitute a different solar mechanism for the one described.
- C
This says a decrease in CO2. The opening mechanism and the reported 20 percent change concern an increase—the direction matters.
- D
Other trace gases are included in the opening, but again the relevant change is an increase, not a decrease.
- E
Replacing fossil-fuel energy with solar energy is proposed as an initial policy measure. It isn't offered as an explanation for a future temperature increase.
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