PrepTest 146, Section 4, Question 24
By 1970 it was well established that ultraviolet(442 more words not shown)
Which one of the following,(20 more words not shown)
- AThe hole in(16 more words not shown)
- BOther manufactured chemicals(14 more words not shown)
- COzone has been(12 more words not shown)
- DMany scientists who(23 more words not shown)
- ECurrent CFC levels(14 more words not shown)
Reading the passage
Stopping emissions does not instantly stop the damage. That is the scientists’ long-term prediction: CFCs already in the atmosphere will keep moving upward and breaking down, so ozone depletion will continue even after production and use cease.
What we’re looking for
The clearest support would be evidence that this lingering damage actually occurs. We want to test that prediction, not just show that CFCs are bad in some general sense.
Working the answers
- ACorrect
This is the predicted result: emissions have almost stopped, yet the ozone hole continues growing for years. The continuing damage supports the scientists’ claim that CFCs already released can have lasting effects.
- B
Other chemicals also travel upward. That does not tell us how long CFCs continue damaging ozone or whether those other chemicals damage it at all.
- C
A more violent reaction is not the same as a longer-lasting effect. This comparison says how ozone reacts with chlorine relative to other chemicals, not whether depletion continues years after CFC emissions stop.
- D
Acceptance of the research methods could increase confidence in the work, but it does not directly confirm the particular long-term prediction. A gives us the predicted outcome itself.
- E
Continued emissions from countries that violate the agreement do not show that earlier emissions keep causing damage after emissions stop. The scientists’ prediction concerns the persistence of the chemicals’ effects, not whether every country will follow the agreement.
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