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28 Jul 2026, 19:00
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Even the smallest amounts of chlorofluorocarbons contribute to the needless and rapid destruction of the Earth's protective ozone layer. The destruction of the ozone layer will lead to catastrophic global warming and greatly increased incidence of skin cancer. The loss of the ozone layer is unacceptable, so chlorofluorocarbons should not be used, especially since _________.
Which of the following best completes the passage?
A. most people live in areas where the ozone layer is thickest
B. users of chlorofluorocarbons are generally unaware of the risks involved
C. most chlorofluorocarbons are used in small amounts
D. safe and equally cheap replacements are readily available
E. the ozone layer serves to protect human life in a variety of ways
Which of the following best completes the passage?
A. most people live in areas where the ozone layer is thickest
B. users of chlorofluorocarbons are generally unaware of the risks involved
C. most chlorofluorocarbons are used in small amounts
D. safe and equally cheap replacements are readily available
E. the ozone layer serves to protect human life in a variety of ways
28 Jul 2026, 22:48
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The answer is D. safe and equally cheap replacements are readily available.
The passage argues that CFCs should not be used. To strengthen this conclusion, you want a reason that removes any objection to stopping their use. If safe, equally cheap replacements are readily available, then there's no real cost to giving up CFCs—which makes the "should not be used" conclusion much stronger.
Here's why the others don't work as well:
A and C actually weaken the argument by suggesting the danger is limited or the amounts are trivial (giving a reason CFCs might be tolerable).
B is about awareness, not about whether stopping use is justified—it doesn't support the conclusion.
E just restates that the ozone layer is valuable, which the passage already assumes; it adds little and doesn't address why we should stop using CFCs specifically.
The passage argues that CFCs should not be used. To strengthen this conclusion, you want a reason that removes any objection to stopping their use. If safe, equally cheap replacements are readily available, then there's no real cost to giving up CFCs—which makes the "should not be used" conclusion much stronger.
Here's why the others don't work as well:
A and C actually weaken the argument by suggesting the danger is limited or the amounts are trivial (giving a reason CFCs might be tolerable).
B is about awareness, not about whether stopping use is justified—it doesn't support the conclusion.
E just restates that the ozone layer is valuable, which the passage already assumes; it adds little and doesn't address why we should stop using CFCs specifically.
29 Jul 2026, 01:45
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A. Where most people live has nothing to do with whether chlorofluorocarbons should be banned.
B. People's awareness of the risks doesn't strengthen the argument against using chlorofluorocarbons.
C. The argument already says even small amounts are harmful, so this doesn't add much.
D. If safe, equally cheap alternatives are available, there's even less reason to keep using chlorofluorocarbons. This directly strengthens the conclusion. Correct
E. We already know the ozone layer protects us from serious harm. Saying it helps in other ways doesn't make the conclusion much stronger. Eliminate
B. People's awareness of the risks doesn't strengthen the argument against using chlorofluorocarbons.
C. The argument already says even small amounts are harmful, so this doesn't add much.
D. If safe, equally cheap alternatives are available, there's even less reason to keep using chlorofluorocarbons. This directly strengthens the conclusion. Correct
E. We already know the ozone layer protects us from serious harm. Saying it helps in other ways doesn't make the conclusion much stronger. Eliminate
