PrepTest 146, Section 4, Question 25
By 1970 it was well established that ultraviolet(442 more words not shown)
Which one of the following(11 more words not shown)
- ALittle or no(11 more words not shown)
- BSkin cancers occur(8 more words not shown)
- CFew chemicals besides(12 more words not shown)
- DRegulating the use(11 more words not shown)
- EThe upward flow(9 more words not shown)
Reading the passage
Follow the chain back to why we cared about ozone in the first place. CFCs damage the ozone layer, and the ozone layer protects us from ultraviolet radiation that contributes to skin cancer. Reducing the CFC problem should therefore help reduce that health risk.
Working the answers
- A
We know chlorine can destroy ozone, not that little or no natural destruction occurs without it. The author describes natural production and destruction in balance without giving chlorine this necessary role in the destruction process.
- B
“Primarily” goes too far. The opening says ultraviolet light “contributes to skin cancer.” It does not rank that contribution against every other cause. A known contributor need not be the main cause.
- C
We are not told how many other chemicals can release chlorine in the upper atmosphere. Focusing on CFCs does not establish that there are few alternatives.
- DCorrect
Regulating CFC use can reduce the chemicals that damage ozone, help preserve the layer’s protection, and thereby reduce exposure to harmful ultraviolet radiation. That is an indirect contribution to lowering skin-cancer incidence: the regulation works through the ozone layer rather than directly treating cancer.
- E
The ozone hole is over Antarctica. That does not establish that most CFCs travel into the stratosphere there. The location of observed damage and the location of most upward movement are different claims.
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